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
2f of Office Building, Heng Hao Peak of High Tech Park, No. 3 Zhan Cai Road, Ling Xia Management Zone, Liaobu Town, Dongguan, Guangdong, China