Every time you connect your phone via Bluetooth, the time will be automatically synchronized, and you can easily set the time. You can set 16 groups of alarm clocks, and each group of alarm clocks can be set for snooze function, which is very convenient. 8 ringtones to choose from. Real-time monitoring of temperature and humidity in your home, with high accuracy. It can cooperate with other Mijia equipment to realize automatic adjustment of indoor temperature and humidity. For example: if the temperature is lower than 20℃, the heater will turn on automatically. The backlight intensity can be adjusted in different periods, and the backlight duration can also be adjusted, from completely off to 30 seconds. Press the alarm clock, the backlight will turn on, you can check the time clearly even at night. Specification: Material: plastic Weight: 106g Size: 80.3 x 41 x 83mm Screen size: 61 x 61mm Temperature range: -9.9~49.9℃ Humidity range: 0~99.9 Batteries: 2 x AA batteries (not included) Number of alarms: 16 Temperature display: support Humidity display: support Bluetooth version: 5.0 APP: Mijia APP (supports temperature and humidity linkage with other devices) Custom alarm repeat mode: support Snooze function: support Backlight duration adjustment: support Backlight brightness adjustment: support Alarm volume adjustment: support Alarm change: support