1. Compatibility: This LiPo battery USB charger is specially designed for 7.4V LiPo batteries and is equipped with an SM3 PIN connector. Please check the connector models on the product page in detail before ordering. 2. Versatile: This 2S 7.4V LiPo battery charger is widely used for batteries of various devices such as RC cars, trucks, boats, drones, planes, quadcopters, helicopters, gliders, and other remote control toys. 3. Safe Charging: The 2S battery charger cable features overload, overcurrent, and shortcircuit protection. Ensure the voltage (7.4V) is compatible before use. The input is DC 5V 2A, and the output is 7.4V 1000mAh, with a USB to SM3 pin plug connection. 4. Indicator Light: The LiPo battery USB charging cable includes an indicator light. During charging, the green light flashes while the red light remains on. When fully charged, the green light stays on and the red light turns off. If the red light remains constantly on, it indicates the charger is not charging your battery.