2.5″L x 1.5″W x 4H. Water resistant, shock/recoil proof. Windage and Elevation adjustable. Durable aerospace aluminum, coupled with a water tight design. Comes with a wire cable remote control pressure pad switch. Please note that top rail CANNOT be removed. Package includes: Green laser + light combo, batteries, pressure pad switch. Green laser output less than 5mW, 532nm, Class IIIA, meets US safety guide. Item Dimensions L x W x H. Maximum Output Power: less than 5mW. Light Frequency: 532nm for green light. If you leave the batteries in your laser sight for a week or more, batteries will be drained. Please take batteries out and store them separately. Dimensions (mm): 97x73x44 L/W/H. Battery Type: 3V CR123A 2pcs. Rail Type: MIL-STD-1913 Picatinny rail. Green Laser, -10? +50? Laser Wavelength: Green Laser: 532nm. Laser Power: Green Laser: less than 5mW, meets US safety guide. LED brightness:180-225 lum. LED working temperature: -40? +80? Battery Runtime: 4 hours.