The Model DXS-31 Supervised Door/Window Transmitter is a battery powered stationary transmitter designed for use with Linear's DXS and DX format receivers. This transmitter can be used in a variety of wireless remote control applications. Triggering the transmitter with its built-in magnetic switch, an external switch or an external glass break detector sends a digitally coded wireless signal to its companion receiver. The digital DXS code format features over a million possible codes. The DXS transmitters are precoded at the factory to unique codes, so no field coding is required. The DXS-31 can send four different codes: alarm, restore, low battery and status. In a typical installation, the magnet is mounted on a door or window and the transmitter is mounted on the frame. When the magnet moves more than 1/2" away from the transmitter, an alarm signal is sent. When the magnet returns next to the unit, a restore signal is sent. Alarms and restores can also be sent from external contacts wired to the terminal block. Pressing the case sends a test transmission that updates the receiver to the current state of the contacts and lights the test indicator. Features Alarm, alarm restore, supervisory and low battery transmissions Includes magnet for internal contact Includes mounting shoe External Contact Terminals DXS format N/O or N/C input loop circuit Powered by 2032 two lithium batteries (included) Optional 2450 lithium batteries can be used for extended life RF frequency: 315 MHz 1.5" W x 3.3" H x 0.88" D