The GE Interlogix TX-E221 is a wireless recessed door/window sensor that is compact and robust for dependable operation. Hidden within the door frame, this contact is virtually invisible when the door is closed making it ideal when discreet sensors are needed. The TX-E Series recessed sensor uses a replaceable lithium battery that lasts up to five years under normal usage and comes with a standard flanged top.
Field proven wireless technology
Easy replaceable battery
Wide gap - up to 1" maximum
Replaceable battery with up to 5 years of battery life (based on usage)