IP Alarm's door/window sensor is an intelligent switch, which you attach to the doors and windows or other places in your home where you want control or an alarm in the event of a break-in.
The sensor is fitted with a discreet diode, which glows when the switch is communicating with the IP Alarm system.
Avoid drilling holes in your doors and windows. Both parts of the sensor should be applied with a little piece of special tape, which is included in the package.
Power source: 1 battery 12V type: NM27
Life span, battery: 1-2 years
Surrounding temperature: 0 ℃ ~ + 40℃ 
Weight: Ca 20g
Outstanding Features:
Real time management and high performance! .
1. One line to receive alarm at one time.
2. Receiving message and long-range control without other cost.
3. Multi-media alarm siren warning.
4. Easy-to-operated without any professional knowledge, Software running stably.
5. Widely used for: House; Office; Market;