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
2nd Floor & 8th Floor, Building 7, High-Tech Industrial Innovation Park, No. 19 Ketai 2nd Road, Guangzhou Private Science Park, Baiyun District, Guangzhou, Guangdong, China