Jiashan Yongfeng Electronic Co., Ltd. locates in Jiashan Zhejiang Province and just 40min. by car far away from Shanghai. We design and produce powerful car amplifiers. We can design and produce products according to your requests. Our delievery time is 30days after we get your final order. If you want to know details about us or you are intrested to our products, pls do not hesitate to contact us.