Zondan is a leading manufacturer who pass ISO13485 approval, we mainly produce patient monitor, fetal monitor, fetal doppler and oximeter. It is one of few companies who has own technology in China. All products we have are developed by ourselvers. The patient monitor, fetal doppler and oximeter are CE approval. They've been sold to all over world. Nowadays, less than 5 Chinese manufacturers can produce information modular patient monitor, but we are one of them. Our oximeter is also hot selling, the FDA certificate for it is applying. Further information please check 3w dot zondan dot com. Hope can establish long term relationship with you!