Fixed Wireless Terminal Quad Band 4G GSM Supported Antipodal Signal GSM Desktop Caller for Office Store 100‑240V US Plug Item Type: Fixed Wireless Terminal Material: ABS Installation: Use GSM Mobile Phone SIM Card Without Ground Wireline Investment. Easy Installation Voice Services: Support International and Domestic, Local, Fixed/Mobile Voice Services Operation: Do Not Change the Original Dialing Habits, and the Operation Habits of Ordinary Telephone Landlines Are the Same Antipodal 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 Occurs No Error: DTMF Transmission Mode, the Caller ID Error is 0 IP Function: Automatic IP Function, Multiple Groups of IP Settings Calling 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 Calls Code Preset: Preset Local Area Code, Local Number Segment, and Forbidden Number or Number Segment Encryption Settings: Such As PIN, PUK Encryption Machine Card Locking Function LED Lights: Display Signal, Standby State, Working State and Other Information Caller ID: Supported Interface Type: RJ11 TDD: B38/B40/B41 WCDMA: B1/B8 GSM: B3/B8 EC25 AF: LTE FDD: B2/B4/B5/B12/B13/B14/B66/B71 WCDMA: B2/B4/B5 LTE FDD: B1/B2/B3/B4/B5/B7/B8/B28 LTE TDD: B40 WCDMA: B1/B2/B5/B8 GSM: B2/B3/B5/B8 Visual Function: None Application Scope: Wireless Access, Security Number Storage Function: Supported Recording Function: None Signal Sensitivity: <-104DBM Transmit Power: <2W Antenna Power: >1.5db Power Supply: 5V 1A Equipment Power: <5W RJ11 Dial Tone Frequency: 450HZ RJ11 Feed Current: 20MA to 40mA RJ11 Reversed Polarity: Supported RJ11 Call: DTMF Working Environment Temperature: Minus 20℃ to Plus 50℃ Operating Environment Relative Humidity: 10 to 90% Product Size: Approx. 16.2 x 10 x 3.1cm / 6.4 x 3.9 x 1.2in ( Manual Measurement, Slight Error May Exist )