Features: Charging Protections: Overcharge / Overdischarge Protections: The module with protective circuit (4056 chip) to prevent the battery voltages from exceeding 4.2V (upper charging limit) or dropping belows 2.5V (lower discharging limit), avoiding damage to the battery. Overcurrents protections: Limit the charging and discharging current to prevent shortcircuits or overloading to ensure safety. Type C features bidirectional charging and discharging: It can charge the battery through Type C, and also reverse to supply power to other devices. Strong compatibility: support standard USB C charging or rechargeable treasure input, no need for special adapter. Applicable DIY devices: such as emergency power supply, outdoor tools, etc., providing flexible power supply solution. Replace traditional chargings: reduce the dependence on dedicated chargings, simplifies the charging and power supply process. Specifications: Item：5V Charging Discharge Module Power Supply：4.5-5.5V Size：about 17x12x5mm/0.67x0.47x0.19in Boost Conversion Capability 5V Output: Boost the 3.7V battery voltages to 5V through the boost module Support USB device power supply Output Current: Typically supports 5V/2A to meet the fast charging needs Package Includes: 1PC 5V Charging Discharge Module note: Please allow 1-2cm errors due to manual measurement,please make sure that do not mind before order. Due to difference between different monitors, the picture may not reflect the actual color the item.