Adapter made by Shenzhen Keyuantai or adapter with same specification as theirs. (Product no. HU10327-7002A, Model no. KYT051002A) specification : AC100 - 250V, 50/60Hz, DC5V 1A Quantity : 5,000 pcs or 10,000 pcs or 25,000 pcs or 50,000 pcs. depends on your price. Pls quote for your bottom price A.S.A.P. Best Regards Harold