Voice Control FunctionThe digital clock has the voice control function, that is when the clock detects the sound over 90 dB, the LED display lights up. Please be noted that you can also light up the digital alarm clock by touching the key 'SNOOZE/LIGHT' and when you keep the clock connecting to the power, the sound control function is turned off and the display always turns on 2 Alarms with Snooze FunctionThe bedside clock has dual alarms and you can set 2 alarms in one day to plan your time appropriately. There are 13 ringtones for you to choose and the volume can be also adjusted. With the snooze function, you can just touch the Snooze/Light button to get extra 5 minutes snooze time.This will be cycled until you press any other key Temperature Display Adjustable BrightnessThe clock can also be also used to test the indoor temperature, and you can switch (Celsius) to (Fahrenheit) via the UP button. During the charging, the LED screen always lights up and automatically adjusts the brightness in 3 levels for different periods and it auto dims during 10:00pm-6:00am. The brightness can be also adjusted in 4 levels manually USB Powered Built-in Backup BatteryThere is a USB charging cable included for the power supply(No Adapter) and built-in 1200mAh Li-ion battery, the bedroom clock ensures long standby time after fully charged. A built-in backup battery to save the settings of your recharging clock in the event of a power failure. (Attention: Please connect with the USB port or ONLY 5V/1A and 5V/2A adapter to charge the clock).