Main Features
1. Conversion of wire/wireless Communication, optional GSM 1 line (1 SIM card), 2 lines (2 SIM cards), 3 lines (3 SIM cards), along with PSTN access.
2. Auto select economic route (LCR)
3. Call transfer function
A. Receive call from PSTN and transfer out through GSM;
B. Receive call from GSM and transfer out through PSTN
4. Auto-convert call number's prefix and dial out
5. Short-code setting and dialing (100 sets)
6. Volume modulation and echo cancel

7. Support caller ID: DTMF Mode
8. If no power, call will be forced to dial out from PSTN
9. Limit of communicating time
10. With LCD: Display data and time, Dial number, Caller ID and operator name, signal quality, talk time.
11. Built-in 1 FXO and 1 FXS
12. 20-100 call records: Number, time, duration
13. Provide reversal signal to external billing device
14. Enable/disable Incoming call. Real-time clock
15. Locking telephone, locking SIM card, locking GSM network ID (optional)

Technical specifications
Power supply
AC input voltage: 160V~300V AC
Power adaptor output: DC7.5V/1.5A
Battery: 6V/4AH Lead-Acid battery (optional)
Maximum charging current: 600MA
DC input voltage range: 7.5V~10V DC
Maximum working current: 700ma (DC7.5V, Average current, excluding charger current)

Application environment
Operating temperature: 0~+45 Celsius
Relative humidity: 10%~95%
Environment noise: ??60dB(A)
Atmospheric pressure: 86~106kPa
GSM parameters
Frequency bands: GSM850/900/1800/1900 MHz automatic switch
Frequency stability: <2.5ppm
Receiver sensitivity: < -103dBm
Transmit power: <2W(900MHz), <1W(1800MHz)
SIM card Interface: 3V
Antenna impedance: 50??

Package: 10PCS/Carton
Internal box
Dimension: 32*18.5*5.5(cm)
G. W.: 0.7kg
External carton
Dimension: 40*36*32(cm)
G. W.: 8.0kg