1. [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 an additional 5 minutes of sleep. Simply press the snooze / light button located above the snooze alarm. This continues until you press another key. 2. [USB charging & built-in backup battery] Our digital alarm clock includes a USB charging cable for power supply (no adapter) and a built-in button battery to save your clock settings in the event of a power failure. (Attention: Please connect the USB port or ONLY 5V / 1A and 5V / 2A adapters to charge the watch.). 3. [Temperature display & adjustable brightness] The travel alarm clock has a temperature display ( / ). You can use the UP button to switch to the display of the temperature from or . During the charging process, the LED screen always lights up and automatically adjusts the brightness in 3 levels for different periods of time. LED digital display, clear and comfortable visual feeling, is automatically dimmed from 10:00 p.m. to 6:00 a.m. You can also adjust the brightness manually in 4 steps. 4. [Voice control] The LED alarm screen lights up when it detects the sound or when you touch the `` SNOOZE / LIGHT '' button. Clap your hands, knock on the table, tap or sound over 90 dB to activate the intelligent alarm clock. The display switches off automatically after 6s. 5. [13 Optional Alarm Tone & Adjustable Volume] It is a non-ticking alarm clock, and you can adjust the volume of 13 alarm tones by pressing + or - when the volume is adjusted or alarmed, easy to adjust . The time display supports both the 12 hour and the 24 hour format.