A visit — yours or an inspector's — is the surest check on a new supplier. Send a date and what you want to see; the request reaches them as an enquiry you can track.
Address
No. 5, Huafeng North Road, Fukuang Community, Huaqiangbei Subdistrict, Futian District, Shenzhen City. 3rd floor, Room 3C66, Longsheng Mobile Market.