... *Receiving and sending separation , low require for Ant isolation ,making it convenient for installation. *Mini design with metal cavity filter ... auto amplitude fixing. *Modules structures ,making it convenient for installation , debugging and maintenance$zhanwei$$zhanwei$GSM DCS 3G ... Conection 3 in One! three frequency bands 900/1800/2100 MHz mobile signal booster,umts gsm dcs receiver,indoor/ outdoor ...