The Model DXS-81 Supervised Bill Trap Transmitter is a battery powered cash drawer bill trap with a built-in transmitter designed for use with Linear's DXS Format receivers. This transmitter can be used in a variety of retail hold-up applications. The DXS-81 is concealed in a cash drawer under a stack of currency, with a single bait bill secured in its money clip. During a hold-up, the cashier removes the stack of currency along with the bait bill. When a bait bill is removed, the transmitter sends a 1-second digitally coded wireless signal to its companion receiver. Four additional 1-second signals are sent within the first minute after the bait bill is removed. When the bait bill is replaced, a restore signal is sent. 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-81 can send four different signals: alarm, restore, low battery, and status. Inside the transmitter is a rolling ball that detects when the cash drawer opens and closes, this determines when status transmissions are sent. Because the transmitter's signal might be shielded in a closed cash drawer, the status signals are sent when the drawer is opened. Optionally, the DXS-81 can transmit status signals once per hour regardless of motion. The transmitter has a red test indicator which lights when a bill is in the trap and the test button is pressed. It also lights when the bait bill is inserted into the trap. For safety, the indicator doesn't light when the bait bill is removed. The test indicator will not light when pressing the test button with the bait bill removed. The test button is disabled for 60-seconds after removing the bait bill. Pressing the test button without a bill in the trap sends an alarm signal. Pressing the test button with a bill in the trap sends a restore signal. The unit is powered from two 3-Volt lithium batteries with an expected battery life of up to two years. When the batteries get low, the test indicator will flash when the test button is pressed or when the bait bill is replaced.