Product Overview: Enhance your electronic projects with our high-performance Lithium Battery Charging Board, designed for efficient and reliable charging, ideal for hobbyists and professionals alike. Specifications: Product Name: Lithium Battery Charging Board Input Voltage: 5V Maximum Charging Current: 1000 mA Charge Cut-Off Voltage: 4.2 V ± 1% Battery Overcharge Protection Voltage: 2.5 V Battery Over-Current Protection Current: 3 A Input Interface: Micro USB Size: 27mm x 17mm How to Use: Connect the micro USB of a mobile charger to the input port, or use the solder joints for input voltage wiring. Attach the battery to the B+ and B- terminals. When connected, the red light indicates charging, and the green light indicates the battery is fully charged. Package Includes: 1 x Lithium Battery Charging Module (battery not included) Note: Please review the dimensions and specifics carefully to ensure compatibility with your needs. All measurements are manual, with an allowance of 0.5-1 inch deviation (1 inch = 2.54 cm). No instructions are provided with this kit; professional installation is highly recommended.