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Digital Antenna Dual Band Wireless Amp DA4KMR-10A - $ 394.33Increased signal strength and excellent reception are now available without a physical connection to your cell phone. How does this work? An outside antenna receives the signal from the cell tower, the signal is amplified by the DA4KMR unit and repeated to your cell phone through the inside antenna. This technology even allows clean and clear wireless functioning of multiple cell phones operating on 800 and 1900 MHz bands simultaneously (coverage area up to 1,000 square feet, or one room, or one standard car interior*). This translates into fewer dropped calls, clear and strong connections and excellent range. Your guests will love you for boosting the signal of their cell phones!Whether you're installing the PowerMax DA4000MR in your boat, car, RV, home or office, complete systems are easy to install and include both inside and outside antennas. This innovative design offers patent pending Dynamic Variable Gain control and amplification of transmit and receive signals. The DA4000MR is the only FCC approved amplifier/repeater for use with all cell carriers in the USA and Canada, including Cingular, AT&T, Verizon, Sprint, Alltel and T-Mobile. Nextel users see model DA4000N.Compatibility: All AMPS, TDMA, PCS, CDMA, GSM850, GSM1900, GPRS Phones