M series is a waterproof small size plug-in self-locking multi-core connector with IP68 protection level. It is specially designed for outdoor applications and contains an inner sleeve and a sealing ring to prevent the penetration of solid and liquid substances. Plug-in self-locking structure, multi-core mechanical positioning pins to prevent mixed insertion, 360° electromagnetic shielding, with welding pin cores, crimping pin cores or printed circuit board pin cores. The shell can be chrome-plated and can be used in defense systems such as aircraft communications, ground vehicles, night vision equipment, simulation or individual combat systems. These products can also be used in automated test equipment, electronic testing and other applications in harsh environment equipment.