Dongguan Callsun Electronic Technology Co., Ltd located in Dongguan----a famous manufacturing city in Guangdong Province, is a high-tech enterprise focusing on R&D, production and marketing of teaching wireless microphone system, which is based on IR wireless audio transmitted technology and 2.4GHz frequency hopping coding technology.Through the joint endeavor, we make a great breakthrough in IR wireless transmission distance (from the traditional 5 meters increased to 10 meters above). So our company succeeded to get the national practical new-type patent in 2007 (patent number: ZL 2007 2.0055874.2). Following closely, our engineers compared the advantages and disadvantages of various PA systems, and applied IR technology to the design and R&D of teaching PA system. Then the perfect teaching voice solution was born-IR wireless microphone system. This system not only can overcome the inconvenient of wired microphone, also can overcome the problems like easy string frequency, easy interference, difficult to management and maintaining, difficult to gain ground in FM wireless audio field. At the same time, it improves the voice quality, embodies the teachers' personality and avoids electromagnetic wave radiation damage to body. In a word, it is the healthy green teaching amplification equipment. For 4 years concentrative research, now IR technology trend to be perfect, our company establishes a complete product system, which covers almost all the needs of teaching wireless microphone system.Our operation philosophy: based on high technology innovation to reduce teachers' burden, improving teaching environment, creating the healthy green campus.Our target: All the teachers have a healthy and practical microphone, protect their voice and body, keep their eternal youth teaching career.We always adhere to the principles of "quality first, service first, prestige supreme", and we are willing to have cooperation with you sincerely from all over the world, create brilliant.Well, here is our new website: http://www.globalsources.com/callsun.coFair Schedule:We will paticipate in:China Sourcing Fair: Electronics & Components on 12-Oct-11 to 15-Oct-11,AsiaWorld-Expo, Hong Kong; Stand No.:6Q12