Features: Brand SM4P 400mA output current 7.4V 3.7V x2 output voltage Automatically adapts to USB input power, quickly and stably recharges the battery USB charger with SM-4P plug for Li-ion battery Suitable for electric RC toys, cars, boats Includes USB charging cable Please check the correct positive/negative connection between the charger and your batteries Intelligent load identification chip prevents excessive current and voltage from entering, protecting the device from damage Specifications: Item: USB Li-ion Battery Charging Cable Input: DC 5V Output Voltage: 7.4V 3.7V x2 Output Current: 400mA Adapter Length: Approx 63mm / 2.47in Note: Before ordering, please confirm the positive and negative terminals of the battery plug Please allow 0–1cm error due to manual measurement; ensure you are comfortable with this before purchasing Due to differences between monitors, the image may not reflect the actual color of the item Package Includes: 1 x Battery Charger