The Celeus digital LCD alarm clock in black features a USB (Universal Serial Bus) Acctim Smart Connector which means that you can use your existing USB (Universal Serial Bus) charger to create a multi-purpose power hub. Charge your phone, tablet or other USB (Universal Serial Bus) device directly from your Acctim Smart Connector clock. There is also a vertical alignment display, the pinnacle of LCD clock display technology. Superior contrast & unparalleled viewing angles. The clock has variable brightness control as well as couples dual alarm with a snooze function. The clock can be powered by the mains, or alternatively by battery which requires 3x AA batteries.