ong QiangXing(ShenZhen) Electronics Limited is a manufacturer specialized in health care products since 2003, certified with MDSAP,ISO13485,FDA 510K,FCC, Medical CE etc. With 18 years' OEM/ODM experience and being the golden supplier of Amazon Top 10 sellers. Our Main products are TENS Unit for pain relief,EMS Muscle Stimulator for muscle training, Skincare Beauty Device,Heating Products etc. With a 20+ professional engineering R&D team,customized orders are easy to realize!