GSM Transmitter, GSMF WT 1.Industrial module 2.Back-up battery 3.IMEI Change 4.Connect with ... ) Simple to install and easy to maintain2) Steady industrial module,reliable design ensures good performance3) Provides optimized circuit directly connecting ... Transmission: 890 ~ 915MHz I) Transmission: 1, 710 ~ 1, 785MHz Ii) Reception: 935 ~ 960MHz Ii) Reception: 1, 805 ~ 1, 880MHz 3) Channel space: 200kHz 4 ...