|Size||as picture||Working Frequency||229.95MHz|
|Weight||Pacakge||White box, Soft foam plastic bag|
|Alarm Time||About 15s||Payment Terms||T/T, Westterm Union,MoneyGram|
1. Quality insurance
2. Professional service
3. Fast delivery
4. Smooth Finish
Principle: Door alarms work by installing the two portions of the device on two separate areas of a structure such as on a door jamb and a door. When the magnetic connection to the device is broken by the pieces moving away from each other (about5mm), an alarm sounds. At the same time, the device can keep the intruder outdoor by "lock up" function. The device is widely used in many place as on wooden door/metal door, gate etc. Easy installation and low price so It is your best choice for your family and your safety.