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SYBER SMA-233 GSM Cell Phone Repeater combining GSM Cellular Booster, act as GSM Cellular Repeater will increase your phone signal bar from ZERO to FULL. Work in frequency 900 Mhz dan can cover area up to 100 square metres. ABSOLUTELY WIRELESS! No phone connector needed. Wherever you are now no need to be worry to losing your customer and your positive business cashflow. In many cases, this cell phone repeater can increase significantly, even from zero bar go to 4, and even full bars.