Recent studies show that your smart phone, mp3 player, headphones,and other handheld devices are covered with more germs and bacteria than the bottom of your shoe! think about it…they come in contact with your hands, face, breath, ears, and different surfacesall day long. violight eliminates bacteria in minutes with advanced germicidal uv and ozone technology. in under 5 minutes your device is sanitized without fussing with abrasive cleaners, messywipes, or liquid sprays that could potentially affect your favorite gadget. requires 3 aa batteries, not included3 l x 0.75 w x 5 h (inches)