When only use the batteries as a power,（No batteries included, bring your own） the screen only lights 16s, you need press SNZ / LIGHT button to light the screen again. Alarm: 1 Group. When only use USB cable as a power, the screen can always light but your setting can not be save when power is off.
The LED Curved Digital Alarm Clock USB Temperature Mirror Display Snooze Bedside UK is a great addition to homes with innovative design and a tech-savvy user.
