The charging contact points of new earbuds are usually covered with semi transparent plastic stickers. If they haven't been removed yet, please remove them to allow the earbuds being charged.Clean the charging contact points on the earbuds and charging case using a cotton swab or fabric. If there's a black oxide layer covering the surface of the charging contact points, please scrape it off with a knife.Fully charge the earbuds. For solving the problem of one side not working, please charge for over 24 hoursIf the above methods does not work, please try to reset the earbuds. The steps for resetting the earbuds vary, please refer to the manual of the product for detailed resetting guideIf the above methods do not work, please contact us