Compatibility: This LiPo battery USB charger is specially designed for 7.4V LiPo batteries and is equipped with SM-3 PIN plug. Please refer to the picture on the product details page to confirm the connector plug models before placing an order. Multipurpose: This 2s 7.4V LiPo battery charger is widely applicable to various equipment batteries, including cars, trucks, boats, drones, airplanes, quadcopters, helicopters, gliders and other remote control toys. Safe Charging: The 2s battery charging cable has overvoltage, overcharge and short circuit protection functions. Before use, make sure the voltage (7.4V) is compatible. Input is DC 5V 2A, output is 7.4V 1000mAh, connector is USB to SM-3 PIN plug. Indicator Light: The lipo battery USB charger cable has an indicator. When charging, the green light flashes and the red light is on. When the battery is fully charged, the green light will stay on and the red light will go out. If the red light is always on, it means the charger is not charging your battery. Lightweight and Convenient: This entry-level battery charging cable weighs only 14g and is incredibly lightweight and convenient to carry.