When selecting the heat shrinkable tube/label tube, choose the glue-containing heat shrinkable tube (also known as double-wall heat shrinkable tube. When the heat shrinkable tube is heated, the outer layer shrinks and the inner layer melts. After heat shrinking, the waterproof level can reach IP66, ensuring copper The wire will not be corroded by water, and the continuity is intact), for easy identification, easy installation and maintenance. For functional products with obvious “positive” or “+”, try to choose red; for functional products with “negative” or “-“, try to choose black; Heat-shrinkable tubes of other colors other than “red” color; the color of the label tube should be more eye-catching, such as “yellow” and “white”. The heat shrinkable tube can be uniformly selected with the same color as the label tube. The size of the heat shrinkable tube can be selected according to the size of the terminal during actual processing, the outer diameter of the wire, and the specification of the corrugated tube.