It is based on magnetic sensor.
IFITech Door/ Window Alarm need two 2AAA alkaline batteries to operate ( not included ).
Remote need a 12V/27A alkaline batteries to operate ( included ).
Once triggered, 105 db super loud alert will be a great deterrence, can effectively scare intruders away.
Low-consumption design,which makes it can work at least a year.
Not only a safety alarm, but also a Doorbell.
1* Alarm, 1* Magnet box, 1* Remote Control, 1* User Manual