Due to State and Federal Law, we sell Syringes and Needles only to the Medical Facilities. Now you can detect movement of a person from a bed, chair, room or doorway with this sensitive discreet monitor * Chime can be set to sound at the monitor or send a signal to the small receiver that can be mounted or placed up to 100 feet away * The chiming unit takes one 9V transistor battery and the door switch takes a specialty battery A23 *