Exhibit 3.1

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

RESIDEO TECHNOLOGIES, INC.

October 26, 2018

RESIDEO TECHNOLOGIES, INC., a corporation organized and existing under the laws of the State of Delaware, DOES HEREBY CERTIFY AS FOLLOWS:

1. The name of the corporation is Resideo Technologies, Inc. The original Certificate of Incorporation of the corporation was filed with the Secretary of State of the State of Delaware on April 24, 2018 under the name HH Spinco Inc. (as amended and in effect immediately prior to the adoption and effectiveness hereof, the “Original Certificate of Incorporation”).

2. This Amended and Restated Certificate of Incorporation has been duly adopted in accordance with Sections 242 and 245 of the General Corporation Law of the State of Delaware (the “DGCL”), and by the written consent of its sole stockholder in accordance with Section 228 of the DGCL, and shall be effective as of 12:01 a.m., Eastern Standard Time, on October 29, 2018.

3. The Original Certificate of Incorporation is hereby amended and restated to read in its entirety as follows:

ARTICLE I

The name of the corporation (hereinafter called the “Corporation”) is Resideo Technologies, Inc.

ARTICLE II

The address of the Corporation’s registered office in the State of Delaware is 251 Little Falls Drive, Wilmington, New Castle County, Delaware 19808. The name of the Corporation’s registered agent at such address is Corporation Service Company.

ARTICLE III

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the DGCL.

ARTICLE IV

SECTION 1. The total number of shares of all classes of stock which the Corporation shall have authority to issue is 800,000,000 shares of capital stock, consisting of (1) 100,000,000 shares of Preferred Stock, par value $0.001 per share (“Preferred Stock”), and (2) 700,000,000 shares of Common Stock, par value $0.001 per share (“Common Stock”). The number of authorized shares of either the Preferred Stock or the Common Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority in voting power of the stock of the Corporation entitled to vote thereon irrespective of the provisions of Section 242(b)(2) of the DGCL (or any successor provision thereto), voting as a single class, and no vote of the holders of either the Preferred Stock or the Common Stock voting separately as a class shall be required therefor.

SECTION 2. The Board of Directors of the Corporation (the “Board of Directors”) is hereby expressly authorized, by resolution or resolutions and without stockholder approval, to provide, out of the unissued shares of Preferred Stock, for series of Preferred Stock and, with respect to each such series, to fix the number of shares constituting such series and the designation of such series, the voting powers (if any) of the shares of such series, and the preferences and relative, participating, optional or other special rights, if any, and any qualifications, limitations or restrictions thereof, of the shares of such series. The powers, preferences and relative, participating, optional and other special rights of each series of Preferred Stock, and the qualifications, limitations or restrictions thereof, if any, may differ from those of any and all other series at any time outstanding.

SECTION 3. (a) Each holder of Common Stock, as such, shall be entitled to one vote for each share of Common Stock held of record by such holder on all matters on which stockholders generally are entitled to vote; provided, however, that, except as otherwise required by law, holders of Common Stock, as such, shall not be entitled to vote on any amendment to this Amended and Restated Certificate of Incorporation (including any Certificate of Designation relating to any series of Preferred Stock) that relates solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either separately or together with the holders of one or more other such series, to vote thereon pursuant to this Amended and Restated Certificate of Incorporation (including any Certificate of Designation relating to any series of Preferred Stock) or pursuant to the DGCL.

(b) Except as otherwise required by law, holders of a series of Preferred Stock, as such, shall be entitled only to such voting rights, if any, as shall expressly be granted to such holders by this Amended and Restated Certificate of Incorporation (including any Certificate of Designation relating to such series).

(c) Subject to applicable law and the rights, if any, of the holders of any outstanding series of Preferred Stock, dividends may be declared and paid on the Common Stock at such times and in such amounts as the Board of Directors in its discretion shall determine.

(d) Upon the dissolution, liquidation or winding up of the Corporation, subject to the rights, if any, of the holders of any outstanding series of Preferred Stock, the holders of the Common Stock, as such, shall be entitled to receive the assets of the Corporation available for distribution to its stockholders ratably in proportion to the number of shares held by them. For the avoidance of doubt, a dissolution, liquidation or winding up shall not be deemed to be occasioned by or to include, without limitation, any voluntary consolidation, reorganization, conversion or merger of the Corporation with or into any other corporation or entity or other corporation or entities or a sale, lease, transfer, exchange or conveyance of all or a part of the Corporation’s assets.

(e) Shares of Common Stock shall not entitle any holder thereof to any pre-emptive, subscription, redemption or conversion rights.

ARTICLE V

SECTION 1. (a) The business and affairs of the Corporation shall be managed by or under the direction of the Board of Directors. Except as otherwise fixed pursuant to the terms of any outstanding series of Preferred Stock pursuant to this Amended and Restated Certificate of Incorporation (including any Certificate of Designation relating to such series of Preferred Stock), the number of directors of the Corporation shall be fixed from time to time by the Board of Directors. In no event shall a decrease in the number of directors constituting the Board of Directors shorten the term of any incumbent director.

(b) The directors, other than those who may be elected by the holders of any series of Preferred Stock voting separately pursuant to this Amended and Restated Certificate of Incorporation (including any Certificate of Designation relating to such series of Preferred Stock), shall be elected by the stockholders entitled to vote thereon at each annual meeting of the stockholders. From the effective date of this Amended and Restated Certificate of Incorporation until the election of the directors at the 2022 annual meeting of stockholders, the directors of the Corporation shall be divided into three classes, designated Class I, Class II and Class III. Each class shall consist, as nearly as may be possible, of one-third of the total number of directors constituting the entire Board of Directors. If the number of directors has changed, any increase or decrease shall be apportioned among the classes so as to maintain the number of directors in each class as nearly equal as possible, and any additional director of any class elected to fill a vacancy resulting from an increase in such class shall hold office for a term that shall coincide with the remaining term of that class. The initial assignment of directors to each such class shall be made by the Board of Directors. The term of office of the initial Class I directors shall expire at the 2019 annual meeting of stockholders, the term of office of the initial Class II directors shall expire at the 2020 annual meeting of stockholders and the term of office of the initial Class III directors shall expire at the 2021 annual meeting of stockholders. Each director elected at the 2019, 2020 or 2021 annual meeting of stockholders shall belong to the same class as the director whose term shall have then expired and who is being succeeded by such director. Each Class I director elected at the 2019 annual meeting of stockholders, each Class II director elected at the 2020 annual meeting of stockholders and each Class III director elected at the 2021 annual meeting of stockholders shall hold office until the 2022 annual meeting of stockholders and, in each case, until his or her respective successor shall have been duly elected and qualified or until his or her earlier resignation or removal. Commencing with the 2022 annual meeting of stockholders, each director shall be elected annually and shall hold office until the next annual meeting of stockholders and until his or her respective successor shall have been duly elected and qualified or until his or her earlier resignation or removal. Pursuant to such procedures, effective as of the conclusion of the 2022 annual meeting of stockholders, the Board of Directors will no longer be classified under Section 141(d) of the DGCL and directors shall no longer be divided into three classes. The election of directors need not be by written ballot.

SECTION 2. Advance notice of nominations for the election of directors shall be given in the manner and to the extent provided in the By-laws of the Corporation.

SECTION 3. (a) Except as otherwise provided for or fixed by or pursuant to the provisions of this Amended and Restated Certificate of Incorporation relating to the rights of the holders of any outstanding series of Preferred Stock (including any Certificate of Designation relating to such series of Preferred Stock), newly created directorships resulting from any increase in the number of directors and any vacancies on the Board of Directors resulting from death, resignation, removal or other cause shall only be filled by the Board of Directors by the affirmative vote of a majority of the remaining directors then in office, even though less than a quorum of the Board of Directors, or by a sole remaining director, or if not so filled, by the stockholders at the next annual meeting thereof. Any director elected in accordance with the first sentence of this Section 3 shall hold office for a term that shall coincide with the remaining term of the class such director is elected to and until such director’s successor shall have been duly elected and qualified or until his or her earlier resignation or removal.

(b) From the effective date of this Amended and Restated Certificate of Incorporation until the election of directors at the 2022 annual meeting of stockholders, any director or the entire Board of Directors may only be removed for cause, such removal to require the affirmative vote of shares representing at least a majority of the votes entitled to be cast by the then outstanding shares of all classes and series of capital stock of the Corporation entitled generally to vote on the election of directors of the Corporation. From and after the 2022 annual meeting of stockholders, any director or the entire Board of Directors may be removed with or without cause, and, in either case, such removal shall require the affirmative vote of shares representing at least a majority of the votes entitled to be cast by the then outstanding shares of all classes and series of capital stock of the Corporation entitled generally to vote on the election of directors of the Corporation. Notwithstanding the foregoing, whenever holders of outstanding shares of one or more series of Preferred Stock voting separately are entitled to elect directors of the Corporation pursuant to the provisions of this Amended and Restated Certificate of Incorporation (including any Certificate of Designation relating to such series of Preferred Stock), any such director of the Corporation so elected may be removed in accordance with this Amended and Restated Certificate of Incorporation (including such Certificate of Designation).

ARTICLE VI

Subject to the rights of the holders of any outstanding series of Preferred Stock, any action required or permitted to be taken by the stockholders of the Corporation must be effected at a duly called annual or special meeting of stockholders of the Corporation and may not be effected by any consent in writing by such stockholders. Except as otherwise required by law and subject to the rights of the holders of any outstanding series of Preferred Stock, special meetings of stockholders of the Corporation may only be called by the Chairman of the Board of Directors or the Board of Directors pursuant to a resolution approved by a majority of the entire Board of Directors (the entire Board of Directors being the total number of authorized directors, whether or not there exist any vacancies or unfilled previously authorized directorships) or as otherwise provided in the By-laws of the Corporation.

ARTICLE VII

In furtherance and not in limitation of the powers conferred upon it by law, the Board of Directors is expressly authorized to adopt, repeal, alter or amend the By-laws of the Corporation by the vote of a majority of the entire Board of Directors. In addition to any requirements of law and any other provision of this Amended and Restated Certificate of Incorporation (and notwithstanding the fact that a lesser percentage may be specified by law), the affirmative vote of the holders of at least a majority of the combined voting power of the then outstanding shares of all classes and series of capital stock of the Corporation entitled generally to vote in the election of directors of the Corporation, voting together as a single class, shall be required for stockholders to adopt, amend, alter or repeal any provision of the By-laws of the Corporation.

ARTICLE VIII

The Corporation reserves the right to amend, alter or repeal any provision contained in this Amended and Restated Certificate of Incorporation, in the manner now or hereafter prescribed by statute, and all rights conferred upon stockholders herein are subject to this reservation.

ARTICLE IX

SECTION 1. To the fullest extent that the DGCL or any other law of the State of Delaware as it exists or as it may hereafter be amended permits the limitation or elimination of the liability of directors, no director of the Corporation shall be liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director.

SECTION 2. To the fullest extent that the DGCL or any other law of the State of Delaware as it exists or as it may hereafter be amended permits, including to the extent that such law or amendment permits the Corporation to provide broader indemnification rights than permitted prior to such law or amendment, the Corporation may provide indemnification of (and advancement of expenses to) its current and former directors, officers and agents (and any other persons to which the DGCL permits the Corporation to provide indemnification) through By-law provisions, agreements with such agents or other persons, votes of stockholders or disinterested directors or otherwise.

SECTION 3. No amendment to or repeal of any Section of this Article IX, nor the adoption of any provision of this Amended and Restated Certificate of Incorporation inconsistent with this Article IX, shall eliminate or reduce the effect of this Article IX in respect of any matter occurring, or any action or proceeding accruing or arising, prior to such amendment, repeal or adoption of an inconsistent provision.

ARTICLE X

Unless the Corporation consents in writing to the selection of an alternative forum, the sole and exclusive forum for (a) any derivative action or proceeding brought on behalf of the Corporation, (b) any action asserting a claim of breach of a fiduciary duty owed by any director, officer or other employee or stockholder of the Corporation to the Corporation or the Corporation’s stockholders, (c) any action asserting a claim arising pursuant to any provision of the DGCL (or any successor provision thereto) or as to which the DGCL (or any successor provision thereto) confers jurisdiction on the Court of Chancery of the State of Delaware, (d) any action asserting a claim governed by the internal affairs doctrine or (e) any other action asserting an “internal corporate claim” as that term is defined in Section 115 of the DGCL shall be the Court of Chancery of the State of Delaware, in all cases to the fullest extent permitted by law, or, if the Court of Chancery of the State of Delaware does not have jurisdiction, any other state or federal court located within the State of Delaware.

ARTICLE XI

The Corporation is to have perpetual existence.

ARTICLE XII

If any provision (or any part thereof) of this Amended and Restated Certificate of Incorporation shall be held invalid, illegal or unenforceable as applied to any circumstance for any reason whatsoever: (i) the validity, legality and enforceability of such provisions in any other circumstance and of the remaining provisions of this Amended and Restated Certificate of Incorporation (including, without limitation, each portion of any section of this Amended and Restated Certificate of Incorporation containing any such provision held to be invalid, illegal or unenforceable that is not itself held to be invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby and (ii) to the fullest extent possible, the provisions of this Amended and Restated Certificate of Incorporation (including, without limitation, each such portion of any section containing any such provision held to be invalid, illegal or unenforceable) shall be construed so as to permit the Corporation to protect its directors, officers, employees and agents from personal liability in respect of their good faith service or for the benefit of the Corporation to the fullest extent permitted by law.

IN WITNESS WHEREOF, this Amended and Restated Certificate of Incorporation has been executed by a duly authorized officer of this Corporation as of the date first above written.