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.