Beamshot ST1 On/Off Switch with Military Grade Tailcap Push Button, Black Constant on/off Easy installation Replacement tailcap switch for all Beamshot Laser Sight Pressure Pad Switch: Durable PVC plastic injection molded cover improves the strength and durability of this product Works with all Beamshot laser sight including BS1000S, BS 1000U, GB800M, GB3000, GB 1000 and GB2000.