Works with the M1 control along with the ELK-M1XRFTW Two-Way Wireless Transceiver. Intended to be used in residential and light commercial installations, the PIR incorporates advanced features designed to ensure reliability, ease of installation, and provide innovative security enhancements. To simplify installation, ELKs Wireless PIR Motion Sensor allows the installer to remotely enable/disable Walk Test Mode from a keypad. Until now, the industry has accepted the process of manually tripping a switch on a one-way wireless PIR to enter walk test mode. The bright high-intensity white LED convenience/security light clearly identifies when the sensor is detecting motion.