MAYMOC compatibility mode Ultra Bright Green Sight Dot Scope Rifle Scope With Free Clamp support 18-21mm. can clip tube diameter 25mm. Clamp upport 18-21mm. can clip tube diameter 25mm. Lightweight and compact Power: under 5mW, Non handheld Class 3R lasers The 1 charger, 1 rechargeable lithium battery(16340 rechargeable lithium battery ), Flashlight can be installed Green day as 30-100 meters to 1000 meters at night