The Krown Visual VibeAlert lets you wake up through your choice of sound, light, and/or vibration. An adjustable backlight lets you dim (or turn off) the display while sleeping, while three adjustable volume frequency settings let you customize the audible alarm to your needs. The convenient built-in USB charging port lets you charge your smartphone overnight! The Krown Visual VibeAlert lets you wake up through your choice of sound, light, and/or vibration. An extra-large digital time display with adjustable backlight lets you dim (or turn off) the display while sleeping, while three adjustable volume frequency settings let you customize the audible alarm to your needs. The convenient built-in USB charging port lets you charge your smartphone overnight. Convenient size for home or travel. Features Large LED digital alarm display with 12- or 24-hour selectable time format Adjustable backlight lets you choose between high/low/off Wake options: Sound, light, bed shaker or a combination Snooze Duration: Select anywhere between 5 and 60 minutes Volume: 90dB with three adjustable settings Frequency: high, medium, and low frequency settings?great for people with varying degrees of hearing loss USB Charging Port (cable not included) Battery Backup (2 AAA batteries not included) Includes (1) Alarm Clock (1) Bed Shaker (1) Smart Dual Power AC Adapter - switches between 110-220V for use in the US or abroad Feature Details Primary Use Home Brand Krown Mfg part # VVIB Warranty 1 Year Manufacturer Warranty Color White Weight (lbs) 0.95 Battery operated? Yes (batteries optional) Batteries included? No Battery details (2) AAA Batteries (Not Included) Country of Manufacture China Alert Type(s) Vibration Flashing Light Loud Audible Yes Yes Yes Tone Control Yes Dual Alarms Yes Battery backup Yes Built-in USB charger Yes Bluetooth No Smartphone Compatibility iOS Android No No Expandable No