Features: This 5V to 21V boosting cable employs advanced boosting technology to efficiently charging 21V lithium batteries, solving high voltages needs for rapid power delivery and serving as a dedicated charging solution for demanding applications. Constructed from quality plastic for enhanced durability and stability, the cable features versatile USB interfaces, ensuring broad compatibility for various devices while resisting wear in everyday use. Ideal for users such as enthusiasts, industrial professional, and anyone needing a reliability replacement for damaged accessories, this cable caters to those prioritizing fast charging and robust performances. Perfect for home, office, or workshop environments, it seamlessly connects 5V USB chargers to power 21V batteries in appliances, tools, and mobile devices for convenient on the go charging. This boosting cable offer straightforward setup and dependable functionality to quickly restores device operations without complex installation steps. Specifications: Product name: 5V to 21V boosting line Component: plastic Cord length:Approx.1meter/39.37inch Color: black boosting cable, suitable for 21V lithium batteries and 5V charging head Usage scenarios: Can be used to replace damaged or old accessories, suitable for occasions where the 5V power supply needs to be increased to 21V Package Includes: 1pc Boosting Cable note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.