Sensative Temp and Light Sensor is an ultra-thin temperature and ambient light monitoring sensor. It measures temperature and ambient light (LUX) in any room you place it. Its ultra-thin design means this sensor can be discretely mounted in any room you want to place it. And you won’t need to worry about charging or changing batteries for up to 10 years, thanks to its uniquely designed and special developed battery that has up to 10 years battery life. When the battery i s worn out, the entire sensor is disposed as electronic waste.