Features: Function: LED display, snooze, alarm clock, USB output, power-off memory, automatic dimming, night light, vibration reminderCompatibility: Dual USB output, for iphone, Android phone charging and various USB powered devices. Brightness adjustment of the electronic clock: Using a high-sensitivity photosensitive sensor, the display brightness can be automatically adjusted according to the ambient light, or you can manually set high, medium, low, off, and four levels of brightness. Night light brightness adjustment: manual eight-level brightness adjustment. Memory function: built-in a CR2032 button battery, when the external power supply is cut off, the for time and various settings remain unchanged. Music settings: 10 and Xuanyin music selection, 15-level volume adjustment. Power supply mode: external 5V1A~5V2A for DC power supply, regular shipment does not include adapter, only 1.5m for DC power supply cable. Specifications: Material: ABS Electronic Clock: 172x43.8x91mm/6.77x1.72x3.58inch Vibrator: 80x80x28.8mm/3.14x3.14x1.13 Screen Size: 7.5 inches Package Includes: 1x Electronic Clock 1x Vibrator 1x English Manual 1x 1.5m USB Cable 1x CR2032 Button Battery (insulation) note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.