Features and Functions:
1) Simple to install and easy to maintain
2) Steady industrial module(SIM340) and reliable design ensures good performance
3) Provides optimized circuit directly connecting the exchange device for Extensions
4) Compatible to most telephones, PBX and VoIP gateways (for call Termination)
5) Connect to Alarm systems to realize wireless alarm(for security use)
6) Strong signals with high gain antenna
7) Support SIM card (1.8V,3V)
8) Support DTMF 2'nd dialing out
9) DTMF CLIP(Caller ID display)
10) Hide subscriber caller id (been sent out)
11) Provides reversal polarity signal for metering
12) Signal indiator and power indicator and working status indicator
13) Suitable for wide voltage range and low power consumption
14) Suitable for all kinds of weather and environment
15) Locking PIN / network (optional)
16) GPRS function(optional)
17) Support IMEI change(optional)
18) Back up li-ion battery(optional)

Specifications:
1) Air interface standard: GSM850/1900Mhz,900/1,800Mhz phase 2+ full band
2) Frequency ranges:
A) GSM 850                                    GSM 1900:
I) Transmission: 869.2 ~ 893.8MHz      I) Transmission: 1, 930 ~ 1, 990MHz
Ii) Reception: 824.2 ~ 848.2MHz          Ii) Reception: 1, 850 ~ 1, 910MHz
B) GSM 900:                                  GSM 1800:
I) Transmission: 890 ~ 915MHz           I) Transmission: 1, 710 ~ 1, 785MHz             
Ii) Reception: 935 ~ 960MHz               Ii) Reception: 1, 805 ~ 1, 880MHz
3) Channel space: 200kHz
4) User line, bell signal: In line with GB/T15279
5) Max power: 0.25W / 0.5W
6) Consumption:
A) Immobility: Less than 25mAh
B) Transmission: Less than 400mAh
7) Sensitivity: -105dB
8) Dial tone frequency: 450MHz (standard)
9) Surrounding temperature: -10°C ~ +40°C
10) Relative humidity: 45% ~ 90% (without frost)
11) Atmosphere pressure: 86 ~ 106KPa
12) Environment noise: <60dB
13) Antenna amplifying: 3.5dB (omni directional), 12dB (certain direction /
Chosen direction)
14) AC power: DC 10V - 20V
15) Input: AC100 - 230V, 50 / 60Hz
16) Output: 12V 1A
17) Switching type / transformer type AC adapter (optional)
18) Connector of power: US or European type
19) Dimensions (L x W x H) (average): 185 x 135 x 22mm
20) Weight:
A) FWT: 400g
B) Full set with AC adapter, antenna and box: 800g
21) Colors: White/blue/black (optional)
22) Connection mode: RJ-11 phone sockets
23) Antenna connection: SMA antenna connection