800/300/250Pcs Heat Shrink Butt Crimp Terminals Waterproof Solder Seal Electrical Butt Connectors Wire Cable Splice Terminal Kit Operating temperature range: minimum melting temperature of solder: 138 C minimum shrinkage temperature: 80 C working temperature: - 55 - 125 shrinkage temperature: 160 Specifications: color: yellow, blue, red, white. Features: shrinkage is 2:1 double wall design pipe: the outer part is polyolefin pipe and the inner part is hot melt adhesive color coding connector tube heat activated waterproof adhesive low temperature welding sleeve the internal solder and hot melt adhesive can be completely waterproof. waterproof solder connector can prevent wire corrosion. meet RoHS, ISO 9001:2008, SGS and CE standards.