Description:
-GSM cellular network outgoing.
-GSM cellular network incoming.
-DTMF Caller ID.
-Support secondary dial.
-Lock card, lock terinal
-Send polarity reversal signal for billing meter while connection.
-Sending 12/16KHz pulse for billing meter while connection is also compatible.
-Support GPRS. (optional)
-Rechargeable battery, keep conversation for at least 3 hour when out of mains supply. (Optional)
-Transmit tariff for our company phone billing meter. (Optional)

Technical Specifications:
-Work Frequency: GSM900/1800MHz or GSM850/900/1800/1900MHz
-Sensitivity: -104dB
-Power supply: DC5V adapter AC 110~240 input