Streamlight 69247 TLR-4G H&K USP Full Size Rail Mounted Tactical Light with Integrated Green Laser and CR2 Lithium Battery - 115 LumensGreen laser provides high visibility long range targeting Features C4 LED technology and a green laser One handed snap on and tighten interface,Ambidextrous momentary steady On Off switch Item is specific to the H&K weapons and do not include keys Serialized for positive identification This is a Class 3R Laser Product, 510 to 530 nm, Output <5mW