Features: brand new and high quality Battery interface: support 3.7V lithium battery full 4.2V welding connection mode, battery charging current is limited to 2.4-A High current charge identification IC gives full play- to the advantage- of 2.4-A current 2.1A 2.4V high current charging for mobile phones requires relevant protocols High efficiency charging and discharging design can reach 90% Ultra small and ultra-thin size 55x19x8mm/2.16x0.75x0.31in Specifications: Item: Type-C Port Dual USB Charging Board Input interface: Type-C and MicroUSB Output interface: Dual High Quality USB 2.4 A Size : approx 55x19x8mm/2.16x0.75x0.31in Package Includes: 1 PC x Type-C Charging Board note: When received mainboard, connect the charging head- to check the LED light In normal application, the battery must be welded. If the battery is twisted, the power supply will be insufficient. If the battery is reversed, the motherboard will burn Batteries connect- in parallel-, not in series, otherwise would burn the mainboard. Do not add a protective plate to the battery Type-C can only be used as input but not output