Features:brand new and high quality SM4P 400mA output current 7.4V 3.7V x2 output voltage Automatically adapt to USB input power, quickly and stably recharge the battery. USB charger SM-4P plug for Li-ion battery electric RC toys car boat USB charging cable Please check the correct Positive/Negtative connection between the charger and your batteries. The intelligent load identification chip blocks excessive current and voltage from entering and protects 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 place an order, please confirm the positive and negative terminals of the battery plug. Please allow 0-1cm error due to manual measurement. plz make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package includes:1 x Battery Charger