1.5 inch LCD display, the monitor data can be clearly read Built-in advanced Sensirion temperature and humidity sensor from Switzerland, sense subtle change of temperature and humidity Built-in CR2032 button battery for one-year standby Works with Mijia APP: via Mijia app to switch on humidifier when indoor humidity is too low and air-conditioner when indoor temperature is too high Intimately designed baby mode to give you and your family a smarter guardian Cute cartoon expression to spell over comfort level, very cute and simple Adopts ABS environmental material, durable and long lasting use Comes with a wall sticker to makes it can be placed wherever you want Specification: Model: LYWSD03MMC CMIIT ID: 2019DP8115 Material: ABS, PMMA Size: 43x43x12.5mm Battery: CR2032 (installed) Operating voltage: DC2.5V - 3V Wireless connection: Bluetooth 4.2 BLE Temperature monitor range: 0℃ - 60℃ Humidity monitor range: 0% - 99% RH Temperature display resolution: 0.1℃ Humidity display resolution:: 1% RH Executive standard: QB/WSDJ 2401-2019