Streamlight 69247 TLR-4G H&K USP Full Size Rail Mounted Tactical Light with Integrated Green Laser and CR2 Lithium Battery - 115 Lumens Green 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, 510-530 nm, Output &lt;5mW