The 10" x 15" Cordless Chair Sensor Pad with Transmitter can be placed on the seat of a wheelchair or a chair. When your patient starts to get up, the alarm will sound. The Cordless Monitor can be placed up to 50' TL-2100G, 100' from 433-EC and 300' from 433-CMU. *Note This pad requires a cordless alarm to operate: Model TL-2100G, 433-CMU, or 433-EC. The Transmitter is activated the day your order ships.