About this item ********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 (AC90-264V suitable for anywhere in the world voltage level). Output: DC 8.4V (+/-0.5V) 1A (Suitable for 7.2V 7.4V 8.4V 2-string Lithium y Pack) Before ordering this adapter, please confirm whether the DC port of the adapter matches your device, and the unmatched DC port will not be able to power your device Output Wire length: 1.1m / 3.5ft. Output interface: 5.5 * 2.5mm / 2.1mm (With built-in leaf spring, Compatible with 5.5x2.5 / 2.1mm ).Before buying, be sure to confirm that the interface size of this product matches with yours. Wrong size will not work!!! If the product you received is different from the picture, please contact us With over-current protection, over-discharge protection, over-voltage protection, overcharge protection, short circuit protection.（Enter Protection mode , with flashing red light）. Manufacturer's One-year After-sale Warranty