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Sensor Type
Door / Window
Glass Break
Contact Closure / Relay
Ease of Installation
Intermediate (Installs < 60 minutes)
United Security
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Glass Breakage Detector Triggers Alarm System
United Security Products 724 Window Bug Glass Break Detector
United Security Products 724 Window Bug Glass Break Detector
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Window Bug
United Security Products 724 Window Bug Glass Break Detector
Item# 7435WB
Price: Normally $13.60 
Hot Deal $10.11
Free shipping on orders over $175 - See Details


  • Works with any alarm system
  • Protects up to 32 square feet of glass surface
  • Triggers alarm upon breakage
  • Dry Circuit so no power is required

Essential Info

The United Security Products Window Bug Glass Break Detector has a patented turning fork technology that enables the Window Bug to sense the shockwave frequency of breaking glass and interrupt the alarm circuit. It won't false alarm from rapping on the outside of the glass with a coin, keys, or sound simulating breaking glass. In addition, the Window Bug has a built in tamper switch making it nearly impossible to defeat.

Each Window Bug will protect up to 32 square feet of glass surface. The patented switch is installed inside, and the Window Bug is tuned to the vibration frequency of breaking glass and will momentarily open or close, depending on the application, to signal an intrusion. Your alarm panel or system must be a fast-acting initiating circuit, with a response time of 20 milliseconds or faster. If you're not sure, just install a Pulse Stretcher (sold separately), to ensure that the system sees the Window Bug's momentary "broken circuit."


What's Included

  • 1x - Window Bug
  • 1x - Window Bug Sticker
  • Specifications


    Manufacturer:United Security
    Manufacturer Product No.:724
    Dimensions:1/2" D x 1 1/4" diameter
    Window Area Protected: 4' x 8'
    Electrical Rating:130 VDC, 50mA max.
    Glass Width:1/8" or 1/4"
    Approvals:UL listed

    Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: United Security Products Inc / Emer Call, Tel: (858) 413-0149


    Window Bug       
    Window Bug       


    27 Ratings
    5 star: 63%  (17)
    4 star: 15%  (4)
    3 star: 4%  (1)
    2 star: 4%  (1)
    1 star: 15%  (4)
    Average Customer Rating
    (27 customer ratings)
    Share your thoughts with other customers
    DARA -- katy, TX   11/14/2013
    Perfect thanks.
    DEAN -- madison, WI   6/4/2013
    Device adheres very well to glass. Needs a fast response transmitter if wireless. Can't really test it's sensitivity without breaking glass, but when used in a door window, will routinely alarm with door closing if set to max sensitivity. Advise in that application to program as interior follower.
    S RENEE -- houston, TX   9/19/2012
    Not sure how it instructions provided!
    AL -- wilmington, OH   6/29/2012
    Great produce & service.
    DONALD -- miramar, FL   6/22/2012
    FRANK -- bronxville, NY   6/7/2012
    Great product and great service.
    RANDY -- harrisburg, IL   4/2/2012
    Received window bug quicker than expected. Haven't installed it yet but have used this brand for many years with no problems.
    JEFFREY -- coral springs, FL   2/13/2012
    Fine product, good pricing and quick delivery. Thank you.
    JAMES -- great neck, NY   1/17/2011
    Fast delivery. Item as described. Good price.
    ROBERT -- massapequa, NY   1/13/2011
    Exactley as promised.
    GARY -- scottsboro, AL   1/10/2011
    Easy to install. Used these as replacements for original units during a remodel. They work fine. Downloaded instructions from web site were helpful.
    LEAH -- beverly hills, CA   8/20/2010
    I was very disappointed. The window bug came with no instructions and no warning that in needed an entire other system to be installed. I have returned them but still not received a refund.
    CLAYTON -- troutman, NC   7/19/2010
    One of my Window Bugs was D.O.A., but Smarthome paid to have it shipped back to them for replacement but item was then on backorder, but they shipped it out just as soon as it came back in stock and I received in a few days. Very Good Customer Service!
    J William White -- Tucson   4/1/2009
    They appear white but they are gray! Useless - and I have to pay for shipping both ways and UPS Red to get white ones in time for installation on SAT. Grrr!
    JEFF -- randallstown, MD   7/18/2008
    Quality instructions (better than the PDF on the website) included with the product would have been nice. The bugs perform as expected. Have a good day!
    JOHN -- foster city, CA   3/23/2008
    Excellent Service. Delivery could not have been faster
    JOHN -- foster city, CA   3/22/2008
    Smarthome's Customer service and tech support could not be better. Great! Company....
    BRAD -- booneville, MS   7/31/2007
    Instructions with the product are too technical. Once I figured out how the sensor worked, it was easy to install and set. I didn't use the instructions at all. I called a local electronics guy, he explained it to me in English, then I was ready to finally move ahead, 3 months after the original order. But yes, they are finally installed and seem to be working great.
    CHRISTOPHER -- craigsville, WV   1/27/2006
    they work well and are what we expected from picture
    ROBERT -- puyallup, WA   9/16/2005
    The price drove me to your site. Thank you for the quick response. The units work well. I will be using your catalog in the near future. Thank you.

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