Interlogix TX-E221 Recessed Door/Window Sensor

The Interlogix TX-E221 is a wireless recessed door and window sensor operating at 319.5 MHz. It sits neatly inside the door frame, making it nearly invisible when the door or window is closed. This sensor uses a replaceable lithium battery that can last up to five years under typical use.

Its compact design allows for easy installation, and the sensor supports a door or window gap of up to 1 inch. The TX-E221 includes a flanged top for secure mounting and relies on proven wireless technology for reliable performance.