* NOTE: The DC interface of this adapter is 5.5x2.5 / 2.1mm, which is only suitable for devices with the same specification DC interface. Cannot be used for other DC interface specification equipment. Please confirm before purchasing. Normally, the specifications of the DC port of the device will be marked on your device manual or label. The unmatched DC interface will not be able to supply power. * Input voltage: AC 120V / 220V (AC100-240V suitable for anywhere in the world voltage level). * Output: DC 16.8V ± 0.1V 1A (Suitable for 14.4V 14.8V 16.8V 4-string Lithium Battery Pack), With over-current protection, over-discharge protection, over-voltage protection, overcharge protection, short circuit protection.（Enter Protection mode , with flashing red light * Output Wire length: 1.2m / about 4ft. DC Output interface: 5.5 * 2.5 2.1mm . Before buying, be sure to confirm that the interface size of this product matches with yours. Wrong size will not work!! * One year after-sales warranty, please contact us if you need it.