250pcs Waterproof Solder Seal Sleeve Heat Shrink Butt Wire Connectors Terminals Default:Default Dual-function for heating and warm

Dual-function for heating and warm keeping

can be charged fully easily with your power bank or laptop

built-in converse connection protection that ensures the circuit won't be burnt out if wrong wiring

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250pcs Waterproof Solder Seal Sleeve Heat Shrink Butt Wire Connectors Terminals Default:Default Dual-function for heating and warm250pcs Waterproof Solder Seal Sleeve Heat Shrink Butt Wire Connectors Terminals Features: Fast, Efficient, No Crimping Required An easy one step connection of wires, soldered, insulated and sealed Solder ring with flux. Melted solder ensures wires strongly connected Transparent heat shrink sleeve allows for precise visual inspection Greater pull strength Fully waterproof seal, protecting against corrosion Ideal used in electronics,railway, marine,