Specifications:
Features:
GSM/pstn access support
Dynamic echo cancelation
Clear voice
Pstn pass-through support when power down

LCD display with bill, time, signal
Caller line identification
Intelligent call routing
GSM/pstn bidirectionalcall divert
Pbx trunk connection or extension connection

Specifications:
1) networks support: GSM 900/1800,
2) operating temperature: 0% - 55%
3) voltage: AC 12v
4) adapter voltage: AC 50hz+1%, 110v or 220v+10%