Feature:1. Support Voice Service: Use this terminal to connect with ordinary wired desk phone and standard SIM card to make local, domestic and international calls.2. Reverse Polarity Signal: GSM desktop caller with reverse polarity signal, can be connected to a billing device or use a computer billing device.3. Multi Group IP Setting: Fully automatic IP function, multi group IP setting, using GSM 4G cell phone SIM card, without changing the original dialing habit, easy to use.4. Strong Signal Reception: GSM ID dialer is easy to install, simple to operate, strong signal reception, clear call setting, long service life and stable performance.5. Widely Used: GSM caller is widely used in remote villages, mountainous areas, houses with weak signals, public telephone stores, offices, telemarketing, ships, trains and other mobile places.Specification:Item Type: Fixed Wireless TerminalMaterial: ABSInstallation: No need to invest in ground wired line, support 4G/GSM cell phone SIM card. Easy installationVoice Services: Support International and Domestic, Local, Fixed/Mobile Voice ServicesOperation: Do Not Change the Original Dialing Habits, and the Operation Habits of Ordinary Telephone Landlines Are the SameAntipodal Signal: With Antipodal Signal, Can Be Connected to the Fare Register or Use a Computer Fare Register.Watchdog: Inbuilt Watchdog Circuit on Duty. Automatically Detects the Running Status of the Device, and Restarts Automatically when a Fault OccursNo Error: DTMF Transmission Mode, the Caller ID Error is 0IP Function: Automatic IP Function, Multiple Groups of IP SettingsCalling Party: Calling Party IP Prefix of Fixed Long Distance Calling, Such As 17951, 17911, and 193, etc.Permission Setting: Permission Setting of Incoming Call of International, National, and Local CallsCode Preset: Preset Local Area Code, Local Number Segment, and Forbidden Number or Number SegmentEncryption Settings: Such As PIN, PUK Encryption Machine Card Locking FunctionLED Lights: Display Signal, Standby State, Working State and Other InformationCaller ID: YesInterface form: RJ11TDD: B38/B40/B41WCDMA: B1/B8GSM: B3/B8EC25 AF:LTE FDD: B2/B4/B5/B12/B13/B14/B66/B71WCDMA: B2/B4/B5LTE FDD: B1/B2/B3/B4/B5/B7/B8/B28LTE TDD: B40 WCDMA: B1/B2/B5/B8 GSM: B2/B3/B5/B8Recording Function: NoneSignal Sensitivity: <-104DBMTransmit Power: <2WAntenna Power: >1.5dbPower Supply: 5V 1AEquipment Power: <5WRJ11 Dial Tone Frequency: 450HZRJ11 Feed Current: 20MA to 40mARJ11 Reversed Polarity: SupportedRJ11 Call: DTMFWorking Environment Temperature: Minus 20 to 50Operating Environment Relative Humidity: 10 to 90%Product Size: L x W, Approx. 15.5 x 10cm / 6.1 x 3.9in ( Manual Measurement, Slight Error May Exist ).Package List:1 x Fixed Wireless Terminal1 x Power Plug1 x Antenna1 x Antenna Receiver1 x Phone Line1 x User Manual