Features: This card is a lithium battery charging board. After the voltage is boost, can supply power to peripherals through the usb port to realize the function. The discharge current of this card is . During the charging process, the charging chip is hot (up to 75 degrees at the temperature of 22 degrees), please do not touch for long time, the chip comes with protective, you can add heat sink appropriately. This module supports various lithium batteries and includes safety mechanisms such as overcharge, over discharge, and short circuits protective for secure usage. Ideal for electronics enthusiasts, developers working on systems and devices, as well as students and educators needing rechargeable power module for experiments and teaching. With its efficient conversion circuitry, this module minimizes energy loss, ensuring operational efficiency while allows easy integration into diverse electronic projects. Specifications: Component:Plastic Size:Approx.23.1x36.1mm/1.42x0.91inch Package Includes: 1Pc Charging Module 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.