Now half the size of the previous model, the V3 Subcompact needs less than 3/4" of Picatinny rail space to easily mount onto the smallest firearms. Its cost-effective, auto-off feature triggers the flash mode after five minutes of nonuse. After one minute in flash time, the laser shuts itself off to extend the battery life. You can press the unit’s button at any time to reset this feature for five more minutes. Laser modes include constant on, pulse and auto-off. Also features windage and elevation adjustments. Strong 6061-T6 aluminum housing. Compatible with any firearm with a minimum of .70" rail space. Easily mounts with a hex-drive crossbar screw. Powered by four 377 batteries for up to five hours in constant-on mode and ten hours in pulse mode. Accommodates left- and right-handed shooters. Range: 500-yd. range at night. Dimensions: 0.92"L x 0.69"W x 0.20"H. Weight: 0.50-oz.