Modern Ultra-Thin Window Alarm 4 Pack with Loud 120dB Alarm and Vibration Sensors Compatible with Virtually Any Window, Glass Break Alarm Perfect for Home, Office, Dorm Room

I think these are a great solution for a low-price security improvement/hack. They are SCREAMING loud and easy to install. I love the blinking light and sticker so any would-be intruders see they are there, and I know the batteries are still working. They have a setting for light or higher sensitivity. I have them on the lower sensitivity and when I tap them they squeal, so I keep them there to avoid going off on windy days. If you clean the glass with window cleaner and let it dry before you stick them on, they will stick better.BEFORE YOU PUT THE STICKER THE BACK- Pay attention to where you want the on/off switch, as well the blinking light indicator. After I put the sticker on the first one, I realized that I had limited placement, unless I wanted the writing to be upside-down/sideways. It's circular, so not a big deal, but now that one has the on/off switch and blinking light down low where it's not as easy for me to see and turn off if/when it's sounding on accident. Also, make sure you stick them where you want them: once on I couldn't pull them off to re-stick without ruining the sticker. I suspect I'll need to use something like WD-40 to get them off.

The two sensitivity settings seem to work reasonably well and don't give unexpected nuisances for bumping, opening closing window, or opening closing garage door. I like the little flashing red LED. Not annoyingly bright or anything but would catch someone's attention at night and I would hope it's a deterrent before someone would try breaking in. When the alarm goes off it's fairly noisy screechy in that room, but the sound doesn't carry so well very far and upstairs if you were a heavy sleeper you could easily miss it. Not sure if neighbors would notice it or not. Definitely good enough tho to really spook someone who's right there when it goes off.Big issue is the sensor thats on my window that gets the full high afternoon sun will go off when it's an especially hot bright sunny day. Other three sensors in indirect sun or shade haven't done this. When it's nuisance alarming from the heat if I switch it down to less sensitive setting from higher sensitivity it was on then it stops alarming. Switch it back up it alarms. Switch it down it stops. I've now left it on low sensitivity for this window all the time, no issues yet but haven't been home while it's been hot and sunny either. Hopefully it's fine.Some ppl complained about the sticker that holds on the sensor to window that has a kinda lame warning logo that you'll see thru the glass. Looks kinda dumb plus it's also clearly an unmonitored brand. Sticker is double sided tho so I just put blank side facing out. Simple. Now you can't tell if it's a wifi switch or cheaper unmonitored.Not sure how long the batteries will last but it's been installed a few months now and still working so worst case you won't have to change them that often.Not exceptional value but not crazy expensive either. Satisfied with purchase so far.

I have bought other brand before this one, but I Like this EVA LOGIK brand due to the very loud sound to scare the intrusions; also regular batteries usage is better than button ones.

Excellent product. Easy to apply and it works (I tried it by knocking on the window. I was concerned that a strong Santa Ana wind will trigger the alarm, but it didn't. The vibration sensor can be adjusted).

These installed well, and the alarm is heck of loud. I only used them for a few weeks, and tested them before installing by clapping 2 spoons together. They were really loud and sensitive.The dang adhesive is extremely sticky as others have already mentioned. I had a hard time removing them as we recently upgraded to alarm panel sensors, but since these were mounted on glass, near the sliding door frame, I used a screwdriver to pry it off, taking time to protect the framing with duct tape and not scratch the actual glass. I highly suggest mounting near the frame to make any removal easier.