Sensor Access Module is designed to access the traditional wired sensors in the market, including CO sensor, motion sensor, smoke sensor, gas sensor, etc. Transforms the signal from traditional wired sensors to Zigbee wireless signal, makes them smart and enables the linkage in smart home systems. Transform the traditional wired sensors to Zigbee smart sensors and enable the phone App alarm and device linkage in the smart home system. Support the detection of the NO/NC signal from the traditional wired sensors. One Sensor Access Module can access three wired sensors.