Customer Reviews

65
4.0 out of 5 stars
Glass Guard Alarm System, 1 Unit
Size Name: 1 UnitChange
Price:$7.98 + Free shipping with Amazon Prime
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76 of 82 people found the following review helpful
on December 18, 2010
Size Name: 1 UnitVerified Purchase
Pros:
-It works. Opening a window or glass door on which the alarm is attached will make it go off.
-It uses two AAA batteries which are widely available.
-It has a Low and a High sensitivity setting.

Cons:
-It goes off at full volume for a fraction of a second when it is turned on. This is unnecessary and disturbing. If you turn it on at night, your neighbors might not appreciate being woken up.
-There are several reasons why this vibration alarm can go off, including strong winds, loud vehicle horns (especially from trucks), and other peculiar loud noises -- even at the Low sensitivity setting. I say this from personal experience. Do you really want to leave your home with this turned on, knowing it may alarm for no good reason? Even if you intend to use it only when someone is home, even so, it is likely that you may sometime forget to turn it off when leaving home. It might've helped if the alarm was either less sensitive or more intelligent, although I know the latter is probably a lot to ask.

Misc comments:
-It doesn't turn off automatically after a while if it has gone on (until the battery is exhausted). This may be a pro or a con, but if it's still on after say ten minutes, it is probably a con.

In summary, because of the false alarms, I cannot recommend this item. I trashed it, and opted for a GE magnetic alarm instead.
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32 of 33 people found the following review helpful
on September 28, 2009
Size Name: 1 Unit
I bought 2 of these devices to protect the front and back glass windows that are vulnerable at home. This alerts me for any break-in and gives me peace of mind. It's so sensitive that it emits a loud pitch sound even just a tap to the glass. Another benefit is that it uses only 2 AAA batteries which is very affordable, and no electrical wiring required. And it has a ON/OFF switch should you need to open the windows. I plan to order 2 more to protect 2 windows in my RV. This product is highly recommended.
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23 of 23 people found the following review helpful
on August 24, 2010
Size Name: 1 UnitVerified Purchase
Works as advertised -- loud, too! Apparently they expect you to install the sensor right in the middle of your window if you want to use the low setting, any place else and they suggest you use high. I stuck it in the corner of my window on high, and it's sensitive enough to go off when we get a close enough lightning strike, but not so sensitive that it's going off with every storm. We've had LOTS of thunderstorms this summer and it only went off once, so I consider that a good balance between being sensitive enough that I'm confident in it without being annoying from too many false alarms.
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19 of 20 people found the following review helpful
on October 4, 2011
Size Name: 1 UnitVerified Purchase
I bought 6 of these alarms just to try out. The reviews were so negative I almost did not make the purchase. I figured that I was just wasting my money but, I wanted them and gave it a try. I am so glad that I did. It's a great little gadget. I am going to get 6 more I like them so much. Yes it's loud but isn't that what you want it to be. I don't care if my neighbors hear, specially if I am in trouble. If someone is touching my windows I want to know about it and if I am sleeping I want to be woken up. I think these alarms coupled with the motion sensor lights and the surveillance system will make me feel more secure. Also, if a lighting storm or high wind sets them off I think that I can go around the house and turn them off until it is over. How much trouble can that be? It is a small price to pay for a little security.
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11 of 11 people found the following review helpful
on January 4, 2012
Size Name: 1 UnitVerified Purchase
I received this alarm last night. I was able to set it up in the middle of the night by placing a pillow over the alarm. I have not heard the alarm at full blast, but I can tell it is loud! This alarm has a great feature of "low" or "high" which is not the sound level of the alarm, it is the sensitivity level. I tested this alarm out by banging on the window and opening the window. However, even on high sensitivity, the alarm was not triggered when we opened the window. It was only triggered when we banged on the window (but it did not take much before it went off). So, with this in mind we decided that we just need to make sure our windows are locked, and the only other way to come in through a window would be by breaking it. So, to avoid false alarms we just set the alarm on low sensitivity. You have to hit the window pretty hard for it to go off on low sensitivity, but I am positive that the window breaking would be enough to set it off.
Altogether, great little alarm!!! Gives my roommate and I a little bit more peace of mind! Would recommend this to anyone!
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13 of 14 people found the following review helpful
on December 2, 2010
Size Name: 1 UnitVerified Purchase
I actually purchased this item because my dog had a habit of tipping over the trash can the minute we left the house. I looked at different sorts of alarms that I could actually use on the trash can that would go off if he tipped it over.

We stuck this on the trash can, set up a video camera and it worked like a charm. The minute my dog actually hit the trash can with his noise the alarm went off. My dog is 47lbs and I've never seen him get scared of anything (even fireworks just made him curious), but this noise was loud enough to startle him (but obviously not physically hurt him). We've set up the camera and alarm a couple times since then and he hasn't even tried going near the trash can - seems like it was a one hit wonder deal!

So overall I'm very happy with this product. It has a high and low setting, both of which work really well depending on what you need. On "low", by body brushing against the trash can did not set it off. On "high", the same movement did set it off. My only negative is that I still don't know how long it takes to reset itself. I'm sure it'd be useful to go off for a long time if there was a burglar, but even then it's so loud I wouldn't want it to go on forever.
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15 of 19 people found the following review helpful
on June 21, 2011
Size Name: 1 UnitVerified Purchase
I read product reviews on this and I was thinking people were being a little too picky.... well I got them in, and they do work well. They have a loud annoying alarm.... BUT I didn't plan on my dog setting them off when she barks. The day I put them up I put 3 of them on the windows inside my house, and the mail man came. My dog barked and all heak broke loose. WOEH EHWHE WEEHHE WEEEOH !!!! Maddening. I tried it again but the barkign woudl set it off. I tried placing them in different spots around the house, and even tried setting the sensitivity higher, but I can't use them practically.

However I think I will keep them and when I go out of town on vacation if I don't leave my dog at home I could potentially set them to work.

I dont know. If I could turn back time I wouldn't have bought them.

Since then I bought a different kind of alarm system... (full system I am happy with)
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4 of 4 people found the following review helpful
on October 4, 2011
Size Name: 1 UnitVerified Purchase
BOUGHT ONE GLASS GAURD VIBRATION ALARM TO SEE HOW AND IF IT WORKS. I AM SO PLEASED THAT I PLAN ON INSTALLING ONE ON
EACH OF MY LOWER LEVEL WINDOWS.WITH AMAZONS FREE SHIPPING AND NO TAX, THE PRICE CAN'T BE BEAT.
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3 of 3 people found the following review helpful
on January 13, 2013
Size Name: 1 UnitVerified Purchase
Very good for a cheap alarm, protected my home from a criminal who tried to break my window. camera caught all on tape great product
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3 of 3 people found the following review helpful
on May 8, 2012
Size Name: 1 UnitVerified Purchase
I bought and installed four of these: on two windows, the front door glass window, and a sliding glass door.

Despite reviews that complain this alarm is too sensitive, I find that it is just about right. They are not very sensitive to low frequencies, but they are good for high frequencies. For example, I can leave the alarm active on the most sensitive setting and open/close either door without alarming. However, a sharp knock or loud tap on the glass and they alarm. I'm sure they would alarm if the glass was broken. I've had no problem with false alarms due to wind, traffic or ambient noise. If anything, they could be made more sensitive to thumps and bumps.

I like the fact that they use AAA batteries instead of watch batteries; I think they will last longer and be louder when alarmed. This is a good product for the money.
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