Paradox LIBERATOR LIB 400B 900MHz wireless Door Contact switch Alarm Sensor

Paradox LIBERATOR LIB400B Digital 900 MHz  Door/Window Sensor

This will only work with Paradox Liberator 900 MHz Receiver
The versatile 900MHz wireless door contact (LIB400B) has two built-in high-sensitivity reed switches that allow you to place the door contact either vertically or horizontally.

A switch or a detection device can be connected to the universal transmitter input terminals in order to provide wireless transmission of the device's open/close status to the Liberator Wireless Receiver Module.
Note: this model does not include the magnet that activates the built-in reed switches
    
Specifications
RF Frequency:     900MHz
Range:     1000ft  line of sight
Antenna:     Built-in Helical antenna
Batteries:     3 "AAA" alkaline batteries (Not-included)
Battery Life:     Up to 3 years
Reed Switch:     Two high-sensitivity reed switches
Input:     Universal transmitter input terminals
Tamper Switch:     Yes
Operating Temperature:     0°C to +50°C (+32°F to +122°F)
Operating Humidity:     85%
Dimensions:     4.9" x 1.8" x 1.3" (12.4cm x 4.6cm x 3.3cm)