ArmaLaser red lasers feature 635nm technology. Up to 5 times brighter than weaker 650nm red lasers. Rock solid mount. Easy do it yourself installation in 5 minutes. Master override switch is recessed in laser body allowing for iron sights practice without laser turning on. Laser activates instantly as you grasp your pistol grip, no button to reach for in a stressful situation. All fingers are on the same level and without a bump on the front strap like Crimson Trace Laser Guard. Almost impossible to accidentally activate in your holster or pocket like mechanical switches can. Full control over laser, MOVE MIDDLE FINGER FORWARD TO TURN LASER OFF, GRASP PISTOL NORMALLY AGAIN TO TURN BACK ON. Extremely well crafted. Experience immediate laser activation as soon as you grasp your pistol. No buttons. Battery Door: Easy battery changes. Adjustable: Both windage and elevation. Battery: 1 commonly-found CR1/3N. Pulsing and steady beams. Material: DuPont Zytel FRN Polymer, Dot Visibility: 1/2" at 50 feet, Battery Life: Up to 6 hours, Output: Ultra-bright Class 3R 635nm <5mW red laser. Weight: 3/4 of an ounce with battery installed. Huge selection of ArmaLaser compatible IWB OWB Pocket holsters and accessories.