Tailcap - Stylus Pro USB - Black Tail cap for Stylus Pro USB - turns light on and off. Push button tail switch. Momentary or constant on operation. Made of machined aluminum. Replacement part fits Stylus Pro USB rechargeable penlight only. This is a tail cap switch for the Stylus Pro USB. Allows the user to turn the light on and off. Push button tail switch with a rubber boot featuring momentary or constant on operation. The switch is made from machined aluminum and is considered a replacement part. 940083