The CTS-25 Compact Electronic Sight is a Red Dot Sight for rifles and carbines. Featuring a 4 MOA round aiming dot. Installed in seconds by using an included riser for rail mounting, the red dot attaches effortlessly to M1913 Picatinny rail sections. Features a side accessible battery compartment, high efficiency led, large function buttons for brightness settings and shock, impact, fog, water and vibration resistant. Includes CR2032 battery and removable riser.