Suitable for conference rooms hotels and other large buildings in the bottom; Expand the base station coverage area; Improve the coverage of mobile phones to send and receive signals; Reduce mobile phone radiation on the human body; Extend mobile phone battery life; Installation of lightweight flexible and can be flexibly configured according to the specific application; Environmental protection products small size low cost; The use of advanced digital filtering technology particularly good band rejection; Coverage program of economic rationality high isolation between the transmitting and receiving antennas transceivers will not produce interference; Outdoor overflow small signals do not interfere with the base station receiver sensitivity