TECKNETDoor Alarm Sensor, Window Alarm Sensors, 2-in-1 Alarm & Chime, 3-level Volume Control, Door Sensor Alarm for Home Security, Wireless Burglar Alarms for House, Shop, Office, Garage (3 PCS)

These anti "break in units" are easy to attach and when activated, loud enough to warn.

Very easy to put in place. Work perfectly. We had an attempt burglary, I described them purely by chance, before they fully got in. These little alarms mean that if they manage to crack the locks and force a door open, the alarms will go off and wake the house hold. They have I piercing sound when they are triggered. I would recommend to anyone. Peace of mind

Very nice and good really happy

Great alarm. Easy to install and good value

I always got very scared when my parents would go away and I was left alone in the house. I bought the 3 pack of these alarms on the off chance it would make me feel more secure and it without a doubt did the job perfectly. I know they wouldn't stop someone for entering but the loudness of them will sure give you the time to call 999 and either hide or find something to protect yourself. I couldn't rave about these anymore. Well worth the small price tag they come with!

These TECKNET (3 pack of) Alarm Sensors are alright & in certain situations would certainly deter or slow down a filthy thief I guess it depends on how qualified a thief they are?If they've got a couple of screwdrivers, pliers or a small crowbar they're not new to theft so they'll know to just rip one of these off or to simply turn it off as it's not loud enough to wake the neighbours really & that's say on a row of council owned terraced houses & the thief would've known that the house, flat whatever was empty as they're extremely good at being extremely bad these scumbags. (plus I don't believe that these are 100db loud anyway ?!?!).I got one for the gentle ring of the backdoor being opened & closed, they're very easy to set up, you just pull out the battery tab find a position for them to go & apply the adhesive strip on to the alarm & apply to your chosen area for the alarm whilst applying firm & even pressure for a few minutes (say 5) so it'll hold well (the same with the smaller part of the alarm).Now I had two spare so I put one on a door upstairs & then decided to put the third from the pack very closely next to the second one making it ~Stereo~ with the two going off together from two different sources, it's louder it'd take just that little longer to disarm them & it weren't a waste of an alarm!Try it, place two close together like in the photo that I've provided or on separate sides of the door, window that you're securing, you'll hear that it's louder & would be more shocking to a burglar if there were alarms sounding from different sources/areas in sync again making them louder & taking longer to disarm that's if the thief/thieves haven't scarped already as it will be confusing & when you're confused with fear you're natural response is to remove yourself from the situation (especially if you bring the long arm of the law into the mix!).

These are so easy to add to a window or door and you can choose the chime or the alarm sound,, also theirs a volume control on them aswell,, they come with everything you need to do the installation well worth the money 5stars

As described. Work well. The magnet part can be placed in any orientation with the sticky patch on any edge. As long as its with contact range.