The selective band booster have follow function and advantage:1     Support all systems of GSM850, GSM900, DCS, PCS, CDMA450, CDMA800,CDMA1900, CDMA2000, WCDMA2100 and AWS.2     Be suitable to large public building, factory, shopping malls, exhibition halls, parking lots, tunnels.3     To automatic shut off function it will avoid deep self-oscillation from jamming the towers.4     Manual gain control via DIP switch (maximum attenuation 31dB by 1dB step).5     Automatic level control.6     Can be locally and remotely monitored and controlled.7     Adopt intermediate frequency filter, very sharp out of band rejection.8     Only amplify specific operators' signals and reject all the others.9     Compact size of elegant designing.10   Easy installation and maintenance.11   Universal power range is AC 90V-264V, attach to power adaptor     Other index according to ETSI or 3GPP standards  coverage areas 2500-3000 square meters  gain 75dB  power 23dBm  dimension                                   250*220*106mm  weight 6.5kg  closet                     aluminum  color gold  band width available upon request  MGC(step attenuation) ≥31dB/ 1dB step  automatic level control ≥15dB  Noise Figure ≤ 6dB  VSWR ≤ 2.0  Group Delay ≤ 4.5µs  Frequency stability ≤ 0.01ppm  power LED power indicator  operating temperature -25--+55celsius  environment conditions IP40