Output Power: 5V/1A Material: PVC+ABS Wire Core: Pure Copper Wire Length: 60cm(23.62in) Wire Diameter (OD): 2.8mm(0.11in) Note: It is recommended to use a 5V 1A charger or a laptop USB port or a computer USB port to charge directly, because their voltage is more stable. (Note: For the sake of your wristband battery life, it is strictly forbidden to plug it into a mobile phone charger to charge) Package Included: 1 x Charging Cable