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 (adapter not included) and a built-in button battery to save clock settings during power outages. Note: Connect only to a 5V / 1A or 5V / 2A adapter via USB port to charge the clock. Temperature display and adjustable brightness: The travel alarm clock shows room 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 automatic brightness levels adjusted to the time of day. The display dims automatically between 10:00 PM and 6:00 AM. You can also manually set one of 4 brightness levels. Light activation feature: The LED alarm clock screen lights up when it detects sound or when you press the "Snooze/Light" button. Clap your hands, tap on a surface, or make a sound above 90 dB to activate the display. The screen turns off automatically after 6 seconds. When connected to power, the sound-activated feature is disabled and the display remains on. 13 alarm tone options and adjustable volume: This quiet, non-ticking alarm clock offers 13 different alarm tones with adjustable volume. Use the "+" or "-" buttons to easily change the volume or select a different alarm tone. Time display supports both 12-hour and 24-hour formats.