Shenzhen Yishi Electronic Technology Development Co., Ltd. was established in 2005. It is a company integrating design, research and development, production, sales, service and marketing, and provides all kinds of telephone peripheral equipment (telephone recorder, SD card telephone recording box, USB telephone recording box) for Chinese and foreign customers. So as to provide sufficient insurance of products quality and meet your demand for higher quality and lower price. The company specialize in manufacturing and marketing Telephone Recording Product and RF modules. Our modern SMT plant and R&D department offer PCB assemble and OEM service too.