Features: Safely charging single cell lithium batteries with this 4.2V USB charging module featuring overcharge/short circuit protective and stable output for extended battery life. Delivers 0.60a charging current via 4.5-5V input, suitable for standard USB power sources like adapters and computer ports. Ideal for electronics enthusiasts, makers, and hobbyists requiring battery charging solution in project. Perfect for integrating into portable devices, robotics prototypes, solar powered systems, or backup power units requiring efficient single cell charging. Its lightweight 4.2V battery charging module simplifies circuit designs while maintaining safety through built in over discharge prevention and thermal management. Specifications: Component:ABS Size:Approx.22x13.5mm/0.86X0.53inch Package Includes: 1Pc Battery Charging Adapter note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.