PLENUE J can also be charged with an authentic Micro USB DC adapter for smart phones. If 5V/1A or higher Micro USB DC adapters are used, charging will be finished in approximately 2 hours. The charging time may vary if the product is in use while charging. Be sure to avoid charging the product in the vicinity of a heating apparatus or in a high-temperature environment. To minimize the risk of damage or fire, never cover the device with any objects (blanket, towel, etc.) or block the natural heat dissipation while charging or during operation.