The CTC 01-01940 RAD PRO RED DOT Open Reflex Sight (Rapid Aiming Dot) Electronic Sight is a full-size Open Reflex Sight for full frame pistols. Featuring a red 3 MOA aiming dot, the CT RAD Pro has a recessed and fully multi-coated lens with a large quick acquisition window. The CT RAD Pro comes with the CT RADIANT Ambient Light Sensor that automatically adjusts the aiming dot's brightness to the surrounding lighting condition. The CT MOTION Sensor detects movement of the firearm and automatically turns the reflex sight on. The sight powers off after 2 minutes of zero movement. The CT RAD Pro comes with an AUTO Shutoff Function that automatically shuts off after 8 consecutive hours of operation to conserve battery life and a manual ON/OFF Function that allows you to turn on or off the sight by using the side brightness buttons. The CT RAD Pro is easily installed on an optics cut slide using the CT RAD footprint that is also compatible with the Docter footprint. It also comes with an additional Low Profile Pic Rail to mount your Pro to most any MILSPEC Pic rail. Textured sides allow for a secure grip when racking the slide. The CT RAD Pro has large brightness setting buttons for easy use even with gloves on. Made of 7075 Series Aerospace Aluminum, it is 30% stronger than most industry standard sights made with 6061 Series Aluminum. The entire CT RAD family has an Innovative top strap design that deflects force if the sight is dropped.Features :Battery Life: 20,000 HoursTop Accessible Battery CompartmentEasy-Rack Textured Sides for Enhanced Grip