Etross GSM-188B is a Fixed Wireless Terminal designed to provide better wireless connectivity between POTS (plain old telephone set) and existing GSM 850/1900Mhz (or 900/1800Mhz) network with high sensitivity to receive signal and large transmitting power to expand extensively the effective coverage of GSM service. It can be used not only in communication for vehicles such as automobiles, trains, floating vehicles, etc., but also in communication for construction sites, isolated islands and rural areas where hardwire-line telephone service is unavailable. So they are widely used in home &office, public phone, rural areas, steamer, railway etc. MAIN FUNCTIONS &FEATURES 1 Simple to install and easy to maintain 2 Steady module (Sim340) & reliable design ensures good performance 3 Provide optimized circuit directly connecting the exchange device for extensions 4 Compatible to most telephones, PBX (for office use) & VoIP gateways (for call termination) 5 Connect to Alarm systems to realize wireless alarm (for security use) 6 Strong signals with high gain antenna 7 Attractive Plastic casing 8 SIM card support (3V, 5V) 9 DTMF CLIP (Caller ID display) 10 Provide reversal polarity signal, 12Khz, 16Khz (selectable) for metering 11 No noise &Clear voice 12 Suitable for wide voltage range &Low power consumption 13 Suitable for all kinds of weather & environment 14 RJ-11 ports (two extensions /phone and line (optional) ) 15 Locking PIN/ Network (optional) SPECIFICATIONS 1.Air Interface Standard GSM 900/1800 MHz Phase 2+ 2.Frequency Ranges Transmission Reception GSM 850 GSM 900 890-915MHz 935-960MHz GSM 1800 1710-1785MHz 1805-1880MHz GSM 1900 3.Channel Space 200KHz 4.User line, bell signal In line with GB/T15279 5.Max Power 0. 25W/0.5W 6.Consume Immobility less than 25MA,Transmission less than 400MA 7.Sensitivity -105db 8.Dialtone frequency 450Mhz (Standard) 9.Surrounding Temperature -10 degree - +40degree Relative humidity:45% - 90% 10.Atmosphere Pressure 86 - 106Pka 11.Environment Noise less than 60db 12.Antenna Amplifying 3.5db-omni directional 12db-certain direction /chosen direction 13.AC Power Input: AC100-230V,50/60Hz Output: 12