The Philio 3 in 1 multi sensor integrates (1) Door/Window Sensor (2) Illumination Sensor (3) Temperature Sensor together to satisfy the picky users who want to have multi functions, small and beautiful devices but don’t want it be unexpected. The sensor can be used as a security device or home automation sensor. When the sensor cooperates with security appliances, the Door/Window sensor and PIR sensor act as an alarm detector. Or, when the sensor works as a home automation device, it can transmit the value of illumination and the temperature to the controller. The temperature sensor can also detect the environment temperature to adjust heater or cooler to achieve preset temperature or detect the abnormal environment temperature (like freeze sensor or fire sensor) to send the warning message.