Hi Karisma, normally you just need to plug your Xkey Air in your PC or any USB power adaptor, than it will charge the battery. If the greed LED does not light up, one case is that the battery was fully charged already, another case is that the battery part was defective, then you need to contact our distributor to get support (For Europe, please contact our German distributor).
Hyperactive Audiotechnik GmbH
Neukirchner Str. 18 D-65510, Huenstetten
+49 (6126) 95365-0