This item is a SpreadNet SN973-MONEY
RF Cash Register-
Money Clip Transmitter made by C&K Systems(Honeywell). The SN973-MONEY is designed to operate in any cash register's bill slot. The SN973-MONEY
is designed to have an American currency bill slid under the retaining
clip and up against the rear stop ring. When this bill is removed, the
transmitter will send an alarm signal to the SpreadNet Receiver (not provided). The
unit also has a tamper switch associated with the battery compartment
door. Opening the door of the battery compartment will cause the
transmitter to send a tamper alarm to the SpreadNet Receiver. It is powered by 2 Lithium 3.6V batteries (not provided).