Dongguan Huashengyi Environmental Purifying Technology Co., Ltd. E-mailem:sales@hsy-airfilter.comNaAllen: sales01@hsy-airfilter.com E-mailem:HSY_waimaobu@126.com Wechat & WhatsApp: +86 13266187584 (Allen) Whatsapp: +86 18985272474 Adresa: No.113 new anyuan road, dongcheng district, dongguan city, China.