3 leds emit uv light in a handy keyring torch uv light is multi functional and can be applied to many situations excellent for exposing dust these uv torches are perfect for the frustrated clean freak in you more notably uv is used to light up clubs and parties use the keyring torch to perfect your clubbing or party outfit and make sure that you light up all night long r brushed aluminiumbattery powered 3 x l44 buttoncellsag13 batteries included5cm x 15cm diameter