ADE Advanced Optics Laser Sight, Super Compact.

Specifications: <5 mW Power, 1 hr Battery Life, Green, Dimensions: 1.79 in L x 1.06 in W x 0.85 in H, Suitable for: Rail-Equipped Pistols, Rifles, Shotguns, Virtually any Firearm with a Modern (M1913 Pica Tinny or Weaver Style) Accessory Rail, Includes: CR1/3N Battery