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This USB charger cable is suitable for 3.7V lithium-ion rechargeable batteries. 100cm cable length, convenient to use,With reverse polarity for protection. USB port input voltage 5V/2A, JST 2pin 2.54mm plug output voltage 4.2V/1A. Easy to operate,Small size and lightweight, portable. Black negative, red positive, the light is red while charging, green light while fully charged.