This contact sensor alarm can help to deter the intruder, wake or alert you if at home and possibly alert eighbors. 

• 1.  Compact, magnetically triggered alarm sounds when window or door is opened
• 2. Multi-purpose - includes entry chime setting that alerts you when people or children are coming & going when you're home
• 3. Useful in various applications - ideal for bedrooms, hotels, garage, apartments & dorm rooms; pool safety alarm; sliding glass door&windows;interior french door alarm; amnesia and wanderers;fridge/drawer open
• 4. Easy to change from off to chime to alarm mode by remote
• 5. Easy to install - self-adhesive types included

?KID'SAFE GUARDER- Excellent Home use product,tiny and fashion, install for kids safety, such as for staircase refrigerator door alarm, patio door alarm, pool door alarm.

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• An alarm need two 2AAA alkaline batteries ( not included ).
• A remote need a 12V/27A alkaline battery ( included ).
• They can work for at least a year with low-consumption design. Not only an alarm, but also a doorbell&reminder for children and elderly when opening door. alarma de la puerta
• Package Size: 4.2*2.5*1.5inch
• Package Weight: 71g
• Package: 2* Alarm, 2* Magnet box, 2* Remote Controller(keyfobs), 2* User Manual
• note: This one has no vibration sensing function, the other one has B07KPKLBCR