Brand new and high quality Instructions: This USB cable lights up red when connected to power, turns off when charging, and lights up red when fully charged. Lightweight, portable, reliable, and powerful USB charger. Function: Intelligent charging management IC is configured inside the charging line, which can accurately charge the 3.7V lithium battery. It automatically stops when fully charged without overcharging. Plug and play. As long as the USB device is connected to the device, it can be charged normally, and other work can be performed as you wish during the charging process. Function Description: The charging cable is equipped with intelligent charging management IC, which can accurately charge the 3.7V lithium battery. It will automatically stop without overcharging. The full charge cutoff voltage is 4.23V, which makes reasonable use of the lithium battery's characteristics and extends the lithium battery's lifespan. Charging indication: Connect to power, the red light is on, the red light is off when the battery is connected to charge, the red light is on when fully charged. Scope of application: Polymer lithium battery, cylindrical lithium battery, digital lithium battery, remote control aircraft lithium battery. The USB battery charger cable with JST connector, output 3.7V 500ma, is suitable for JST 3.7V(1S) Lipo battery. Note: Only for Lipo batteries, do not use for Ni or Ni-Cd batteries. Specification: Material: ABS Plug model: JST connector Type: 3.7V USB charging cable Input: DC 5V 0.5-2A Output: DC 4.2V/500mA Standard voltage: 4.2V Color: Black Size: One Size Cable length: 630mm Quantity: 1 pc Note: Transition: 1 cm = 10 mm = 0.39 inches No retail package. Please allow 1-3mm error due to manual measurement. Please make sure you don't mind before bidding. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1pc USB charging cable JST connector charger