Features: ?Frequency range: 850 MHz /900 MHz /1800MHz/1900MHz 旳dopts industrial module to ensure good performance ?Internal or external antenna ?LCD display: large dot matrix LCD ?Support Chinese and English SMS ?Support GPRS (optional) ?Save the latest 10 missed, 10 received and 10 dialed calls ?Built-in Li-ion battery ?Talking time- 3hours; Standby time- 48hours ?Support network management (NMS) ?Lock phone, lock SIM Card ?SelectaLock phone, lock SIM Card ?Prefix number dialing automatically ?Call divert, fast dialing Specifications: 1) Air interface standard: GSM 900 / 1,800MHz phase 2+ 2) Frequency ranges: a) GSM 900: i) Transmission: 890 ~ 915MHz ii) Reception: 935 ~ 960MHz b) GSM 1800: i) Transmission: 1,710 ~ 1,785MHz ii) Reception: 1,805 ~ 1,880MHz 3) Channel space: 200KHz 4) Max power: 0.25W 2W 5) Consumption: a) Immobility: less than 25mA b) Transmission: less than 400mA 6) Sensitivity: -105dB 7) Surrounding temperature: -10癈 ~ +40癈 8) Relative humidity: 45% ~ 90% (without frost) 9) Atmosphere pressure: 86 ~ 106KPa 10) Environment noise: <60dB 11) Antenna amplifying: 3.5dB (omni directional), 12dB (certain direction / chosen direction) 12) AC power: DC5.5V 13) Connector of power: China 14) Dimensions (L x W x H) (average): 230 x 180 x 60mm 15) Weight: a) FWP: 600g b) Full set with AC adapter, antenna and box: 750g 16) Colors: black / grey (optional) 17) Antenna connection: SMA antenna connection Applications: 1) For public use as payphones 2) For office and home use 3) For rural and mountainous areas 4) For mobile carriages, like ships, automobiles and trains 5) For those places where hardwire-line telephone service