Nihowban HG54G Strobe Laser Sight for Pistol Handgun, Green.

• Offers the brightest Green laser allowed by Law. Non-handheld class 3R laser product, < 5Mw power output. Ultra lightweight and compact 2.2 x 1.13 x 0.94 inches
• Fit rail-equipped pistols, rifles and shotguns. The laser sight fits onto virtually any firearm with a modern (M1913 Pica tinny or Weaver-style) accessory rail
• Proprietary mounting design provides two spring loaded pillar to push to rail slot for rock solid zero movement. Weight: 1.13oz (Battery included). Does NOT fits Berreta due to extra wide trigger guard.
• Operates with one CR1/3N batteries(included). Battery life: 1 hours. The unit is quickly and easily, user-installed in moments and can be painlessly transferred from firearm to firearm
• Controlled by ambidextrous switch. It offers two modes: constant-on and strobe. This allows the user to easily set their mode based on personal need or preference