This palm-sized device uses UV-C light (the same kind trusted to sterilize hospital instruments) to eliminate up to 99.9% of bacteria, viruses, and mold in 20 seconds. UV-C light is found in the sun's rays, and the wand harnesses this naturally occurring ultraviolet light to sterilize workplace keyboards, public restroom surfaces, and doorknobs, as well as items in the home that sustain germ vitality such as toothbrushes and cutting boards. The light flips up from the handle at the touch of a button; all you need to do is hold the device 3" above the infected surface and it automatically destroys the DNA of microorganisms that trigger allergies, asthma, and the common cold. Bulb lasts up to seven years. Rechargeable battery lasts four hours after a two-hour charge (requires a 12-hour initial charge). Includes AC adapter to charge the battery. 4 1/2" L x 1 2/3" W x 1" D. (3 oz.)