Higoo Red Laser Dot Sight, Military Picatinny Rail Tactical Hungting Red Laser Scope, Red Laser Pointer Presenter Pen Aiming Sight Tactical red laser sight, power less than 1mw. Power by 3x AG13 battery(included) Compatible with both 11mm and 20mm rail. Package included 1x red laser, 1x manual, 2x hex wrench, 3x AG13 battery.