1Sensing temperature and humidity changes, supports alarm / snooze function and knob adjustment, adjust hour and minute by rotating button, more convenient. 2With mobile phone charging function, USB1A power output charging port, in the case of external power supply, there is a charging port on the side to charge the mobile phone. 3The digital display of the alarm clock is clearer, smaller and powerful. With backlight, which can be adapted to use in different environments and light sources. 4No light control function when using external power supply, the backlight can be adjusted in three steps through the upper button: High-Half-Low-Off. 5Intelligent light control induction, when using battery power (battery not included), it will automatically turn on the backlight according to the weak ambient light. If the ambient light is weak, the backlight will be turned on, otherwise it will not be turned on, which is convenient for watching at night without affecting sleep.Condition: 100% Item Type: Clock Material: ABS + Electronic Components Color: Black Power Supply: 3 x 1.5V AAA Dry Battery (Not Included) / Plug Function: Time Display Temperature Range: 0~50, 32~122, Accuracy -/-1, test once every 30 seconds Humidity Range: 20%~99%, Accuracy +/-5%, test once every 30 seconds Snooze / Alarm Music Adjustable Backlight Brightness Light Control Backlight 1A Power Output Can Charge Mobile Phone 12/24 Hour Switching Product Size: Approx. 13.5 x 5.5 x 8 cm / 5.3 x 2.2 x 3.1 in Weight: Approx. 300g / 10.6oz1 x Electronic Alarm Clock (Battery Not Included)1 x Plug1 x English User Manual1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.