100% Brand NewInput: 5V Output:4.2VFor 3.7V Lipo battery4 Charging Ports: can charge 4pcs batteries at one timeOvercharge Protection and Short-Circuit Protection for every Charging PortBattery part3.7V 750mAH Lipo batterySize:43mm*24mm*10mmContinuous discharge rate: 25CFuel: electricityThe battery is low consume of energy and environment protecting.Battery Compatible withMJX X400 RC Quadcopter Helicopter Spare PartsX300C，X500，X800