PC type small circular electrical connectors are widely used for circuit connections between various electronic instruments and electrical equipment.  The product has a small volume, a metal aluminum shell, light weight, and a sealed socket.  There are two types of insulators: bakelite and plastic, and two types of shells: green and yellow.  The connection method is threaded connection, with reliable electrical connection and convenient use.  There are two types of product installation methods: flange type and cable type, with circular and square flange plates.  The waterproof level of the product has reached Ip68.