1Support international and domestic, local, fixed/mobile voice services. 2Do not change the old dialing habits, the same as ordinary telephone landline operation habits. 3Built-in watchdog duty circuit, automatic detection of equipment operating status, automatic restart failure. 4Standard communication voltage, can be connected with the user switch (PABX). 5Fixed long-distance automatic insertion of the calling IP prefix, such as 17951,17911,193 and so on.Features: Easy to install. No need to invest in ground wire line, use GSM mobile phone SIM card.Support international and domestic, local, fixed/mobile voice services.Do not change the old dialing habits, the same as ordinary telephone landline operation habits.With a reverse polarity signal, you can access the meter or use the computer meter.Built-in watchdog duty circuit, automatic detection of equipment operating status, automatic restart failure.Standard communication voltage, can be connected with the user switch (PABX).Automatic IP function, multiple IP settings.Fixed long-distance automatic insertion of the calling IP prefix, such as 17951,17911,193 and so on.International, domestic, local calls and other types of access settings.Preset local area number, local segment and forbidden dialing number or segment.Encryption settings, such as PIN code, PUK code encryption card lock function.LED lights display information such as signal, standby status, working status, etc.Specifications: PLug: 100-240V Color: white Caller ID: Yes Interface form: RJ11 Support network: GSM: 1900/1800/900/850M Visual function: None Scope of application: wireless access, security Number storage function: Yes Recording function: None Signal sensitivity: Transmitting power: Antenna power: >1.5db Power: 5V 1AEquipment PowerRJ11 Working Voltage: DC 8~12V RJ11 Standby Voltage: DC 40~48V RJ11 Dial-up Audio Frequency: 450HZ RJ11 Feed Current: 20MA~40mA