Main Features 1. AD/DC Type-C powered with 1000mAh lithium battery (backup power supply maintains 72 hours of backup battery operation, but does not drive the vibrator to vibrate) 2. 2.3-inch 4-digit LED (RBG) 3. Selectable Clock display color (orange/green) 4. Night Clock display mode i) daytime-orange with evening-light blue, ii) daytime-green with evening-pink (light blue/pink from 23:00 pm to 6:59 am) 5. 2 x preset alarm clocks 6. Independent alarm clock ON/OFF control, Alarm clock ON status icon display 7. Check preset Alarm time 8. 5 alarm music + 3 pure square wave tones to choose from 9. 2 x Vibration OUT, plug in from the bottom, anti-loose design 10. RF 868/915 built-in transmitter,Alarm clock reminder can be sent to the Multi-alert receiver 11. Built-in 56mm speaker (up to 90dB alarm sound) 12. 10-minute alarm snooze mode 13. Snooze button can be used as a Call button 14. 12/24 hour display selection 15. Volume control 16. Mute switch, the status is displayed by LED icon 17. Flashing switch, the status is displayed by LED icon 18. Display brightness control 19. Night light brightness control