This compact RD01 red dot sights is independently developed and produced by BINOCK, an optical technology expert with more than 10 years experience, and offers a fast and precise target acquisition to users. Clear 22mm aperture and crisp red dot is ideal for close-range shooting, providing a wide field of view and fast target tracking in various situations. This red dot sights is reliable in any tactical or outdoor environment with the long-lasting CR2032 lithium coin cell.