Linear Wireless Security 1-Channel Pendant Remote 
With 2-Button Lockout ET-1B
The Model ET-1B Emergency Transmitter is a single-channel transmitter normally used as a “panic button” in security systems. It is also used in many remote switching applications where a portable transmitter is required. Pressing both buttons on the sides of the transmitter at the same time will send a transmission.
This keypad will be shipped on the next business day and includes a 30-day return policy.
General Specifications:

Encoding Technique: 8-position cut trace provided for code setting.
Number of Codes: 256
RF Carrier Frequency: 303.875 MHz
Current Consumption: 3 mA DC transmitting
Power: 12 VDC battery (supplied)
Operating Temperature Range: Battery limited.
Dimensions: 1.72 in L x .75 in W x 1.76 in H (44 x 19 x 45 mm)
Features

2-Button lockout operation
Water resistant
Includes neck chain.
Standard digital format: 256 selectable codes
Powered by one 12-volt battery (included)