Based in shenzhen of china, yda is a professional manufacturer specializing in designing and producing switching power supplies, switching power adapter, psu,ac adapters,smps adaptor, battery chargers and dc/dc converter etc, which are widely used in the fields of electronic machines, electrical appliance, ipod & iphone,networking and communication equipments etc. with years of experience, we adhere to our stringent quality control system and following iso9001 system, all our products have met the worldwide safety approvals such as ul, cul, cec, csa, tuv, gs, fcc, ce, pse, bs, cb, ccc, ek, saa, c-tick,sgs/rohs etc. to meet our customers requirements, we also design oem products for different specification. now, we have been exporting our products to worldwide markets, especially in north america, japan, korea, europe and middle east. various products specification, lower price, high quality and excellent service, we try to be your best choice. if anything we can do to help, please do not hesitate to contact us. thanks!