MAYMOC Mini Reflex Holographic Green+Red Dot Sight Scope Dual Brightness Picatinny 20mm Rail Mount Lightweight and compact Power: under 5mW, Non handheld Class 3R lasers.Green+Red,10 Levels Brightness 20mm adjustable sliding base. CR2032 battery. Tubeless design with reflex lens ( ruby lens coating) provides a wide field of view. Eye Relief (mm):Unlimited