... use directly !!!!! Signal booster for dual band of GSM990 A mobile phone signal repeater provides the ultimate solution in any area where ... work well due to leak of signals. The repeater device features easy installation & operation, build-in indoor antenna and no interference. It could ... questions, pls fee free to contact us. full set dual band booster,W/ cable&antennas,1000M2 to work,GSM+DCS,GSM ...