Streamlight 69220 TLR-3 Weapon Mounted Tactical Light with Rail Locating Keys - 125 Lumens White light illuminator Uses Lithium batteries Includes rail locating keys for Use with Picatinny or Glock style rails IPX7 waterproof to 1 meter for 30 minutes Runs 1.5 continuous hours to the 10% output level.Battery Type:CR2 Lithium