Mini Red Dot Sight QD Cam Lock Phantom RT6H Mini Micro Red Dotx 40mm Sight Ambient Light Sensor QD Quick Detach Cam Lever Mount AAA Battery, Anodized Matte Black, Ruby Coated Lens Use one AAA akaline Battery Installs in seconds with adjustable QD Cam lock lever Smart ambient light sensor on top to automatically set the intensity of the dot Push button light switches keep last intensity setting when power is turned back on Optimal 38mm center height is perfect for Use on flat top rifles