Feature: 1. Strong Receiving Ability: Our wireless terminals are easy to operate, have strong signal receiving ability, clear call settings, long service life and stable performance. 2. Function: Use GSM 3G, WCDMA 4G LTE network to run. Using this terminal to connect with ordinary wired desk phone and standard SIM card, you can make local, domestic and international calls. 3. Reverse Polarity Signal: Do not change the original dialing habits, the same as ordinary telephone landline operating habits, with reverse polarity signal, can be connected to the meter or use the computer meter. 4. Easy to Install: No need to invest in ground wire line, use GSM mobile phone SIM card, easy to install, won't take too much time. 5. Wide Application: Widely used in remote villages, mountainous areas, houses with weak signals, public telephone shops, offices, telephone sales, ships, trains and other mobile places. Specification: Item Type: GSM Fixed Wireless Terminal Material:ABS Product Size: Length x Width Approx. 15.5 x 10cm / 6.1 x 3.9in (Manual Measurement, There Will be 0-1cm Error) SIM Card: No Need to Invest in Ground Wire Line, Use GSM Mobile Phone SIM Card. Easy to Install Support Business: Support International and Domestic, Local, Fixed, Mobile Voice Services Operating Habits: Do Not Change the Original Dialing Habits, the Same As Ordinary Telephone Landline Operating Habits Reverse Polarity Signal: with Reverse Polarity Signal, Can Be Connected to Meter or Use Computer Meter Automatic Detection: Built in Watchdog Duty Circuit. Automatic Detection of Equipment Running Status, Automatic Restart in Case of Failure Transmission Mode: DTMF Transmission Mode, Caller Id 0 Error Function: Fully Automatic Ip Function, Multiple Sets of Ip Settings Ip Prefix: the Calling Ip Prefix Automatically Inserted by Fixed Toll, Such As 17951, 17911, 193, Etc. Permission Setting: Various Permission Settings for the Called Party, Such As International, Domestic and Local Calls Default: Default Local Area Code, Local Number Segment and Prohibited Number or Number Segment Encryption Settings: Encryption Settings, Such As PIN Code, PUK Code Encryption Machine Card Lock Function LED Lights: LED Lights Display Information Such As Signal, Standby Status, Working Status, Etc. Caller ID: Yes Interface Form: RJ11 Network Support: LTE FDD: B1 B2 B3 B4 B5 B7 B8 B28, LTE TDD B40, WCDMA B1 B2 B5, B8GSM B2 B3 B5 B8 Visual Function: None Scope of Application: Wireless Access, Security Number Storage Function: Yes Recording Function: None Network Parameters GSM: 1900 1800 900 850M Signal Sensitivity: < -104DBM Transmit Power: 1.5db Power: 5V 1A Device Power: