Features: Function: LED display, snooze, alarm clock, dual USB output, power-off memory, automatic dimming, night light, vibration reminder. Compatibility: 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 the brightness can be manually set to three levels of high, medium and low. Night light brightness adjustment: manual four-level brightness adjustment. Memory function: a CR2016 button battery is built-in, when the external power supply is cut off, the for time and various settings remain unchanged. 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: 158x55x87mm/6.22x2.16x3.42inch Vibrator: 80x80x28.8mm/3.14x3.14x1.13inch Package Includes: 1x Electronic Clock 1x Vibrator 1x English Manual 1x 1.5m USB Cable 1x CR2016 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.