Specifications:Pistol Flashlight with Strobe feature, Picatinny MountElectronic Control Buttons are completely Ambidextrous there are three buttons on each side of the Pistol Flashlight body. There is a Momentary button on top, Constant On/Off button on the bottom, and the Flashlight Strobe button is at the front.Momentary & Constant On/Off buttons are positioned and angled ergonomically. They are accessible from your Trigger Finger or your support hand thumb when gripping the pistol.3W Ultra Bright 200 Lumen CREEA(R) LED flashlightSlides onto most Weaver / Picatinny / MIL-STD 1913/ Pistol accessory spec railsDimensions: 3.4L x 1.5W x 1.3HWeight: 3.8 oz. with BatteryBlack Anodized Aluminum bodyUses 1 each CR123A Battery (Included)US PAT. D807,981