Sheena Corget Technology Co., Ltd was established in April 2007. We are a professional network intercom developer specialized in researching, manufacturing, and selling VoIP data products. SMART-PTT public-network cluster intercom system was R&D all by ourselves and wireless communication could be realized through various kinds of networks(LTE\WIMAX\3G\WIFI\CDMA 1x\GPRS). The biggest advantage of our products is that there is no more limit on communication distance at all. As long as there is network coverage, our system can realize scheduling.