2 alarms with snooze function: The alarm clock has two separate alarm times. You can set 2 alarms in one day to schedule your time accordingly. The snooze function allows for an extra 5 minutes of sleep. Simply press the snooze / light button located on the top of the alarm clock. The alarm will sound until you press another button. USB charging and built-in backup battery: The digital alarm clock includes a USB charging cable for power supply (no adapter included) and a built-in button battery to retain clock settings during power outages. Please connect to a 5V / 1A or 5V / 2A adapter only. Temperature display and adjustable brightness: The travel alarm clock shows temperature in Celsius or Fahrenheit. Use the UP button to switch between C and F. The LED screen lights up during charging and offers 3 auto-adjusted brightness levels based on time of day. The display automatically dims between 22:00 and 6:00. Manual brightness control is available in 4 levels. Voice control: The LED alarm clock screen activates when it detects sound or when the "Snooze/Light" button is touched. Clap hands, tap a surface, or make a sound over 90 dB to turn on the display. The screen turns off automatically after 6 seconds. When connected to power, the sound activation feature is disabled and the display remains on. 13 optional alarm tones and adjustable volume: This non-ticking alarm clock offers 13 selectable alarm tones with adjustable volume using the "+" or "-" buttons. Volume and alarm selection are easy to adjust. Time display supports both 12-hour and 24-hour formats.