1、EASY TO OPERATE: Solder sealed wire connectors do not need to be crimped, just put the stripped wires into the solder sleeve and heat evenly to complete the connection 2、WATERPROOF PERFORMANCE: Double wall design (polyolefin tube on the outside, hot glue and solder on the inside) to ensure perfect insulation and waterproof performance, prevent wire corrosion even in humid environment 3、NO SLIDE WIRE CONNECTION: The hot glue properties of the internal solder ensure strong tensile strength and tear resistance. When heated, the solder melts to hold the wires securely and will never slip out of the connector 4、SUFFICIENT QUANTITY: A Total of 270 soldered heat shrink connectors, specific colors in specific sizes, and clear sleeves provide precise visual inspection during the connection process. 5、WIDE APPLICATIONS: Solder wire connectors are best for your ships, vehicles, airplanes, homes, and even science projects, ensuring safe and weatherproof soldering.