• UV-C Sterilizer installed to aim the buttons • Sterilization process: 30sec(on) UV-C on every hour • UV Lighting angle(directivity): Typical 70˚ • Effective Range: 30cm after 30sec x 5 times • Radiant power: 10.0mW at 100mA • Total quantity of light(30sec): 5400㎼ • Power: AAA battery x2 • Size: 63mm x 48mm x 35mm (WxDxH)