Features: Professional charging module with ±1% accuracy 4.2V termination voltages and narrow 7mm design, ideal for space constrained DIY projects requiring reliable charging. Features three stage charging, maintaining safe operation across extreme temperatures ( 40°C~85°C) with minimal 2μA consumption. Perfect for electronics hobbyists, power tool modifiers, and maker charging solution for 18650/21700/32700 cells in tight space like upgraded electric mosquitoes swatters. Optimizes battery compartment layouts by into side of 3.7V lithium devices, circuit space while handling 5-6V Type C input from standard phone adapter. Engineered for thermal stability during prolonged charging cycles, this universal module safely charges depleted batteries without compromising performances in high drain applications. Specifications: Component:Plastic Input voltages: 4-8V Output current: 1.20A Working temperature:-40°C-85℃ Package Includes: 1Pc Charging Board 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.