| Model | M23 A | 
| Product Feature | Tri-Band GSM/GPRS module : EGSM900/DCS1800/PCS1900Compliant with GSM Phase 2+ standardControl via AT commandsSupply Voltage range from 3.3v to 4.2v | 
| Voice | HR/FR/EFRNoise deduction, echo cancellationTelephonyEmergency CallDual Tone Multi Frequency Function (DTMF) | 
| Short Message Service (SMS) | Delivery ReportPoint to point MT/MOCell Broadcast | 
| GSM Circuit Switched Data | AsynchronousTransparent/ non-transparentUp to 14.4kbps | 
| GPRS Packet Data | GPRS Class BGPRS Multi-slot Class 44 slot downlink (86.6kbps), 2 slot uplink (42.8kbps) max 5 slotCoding Schemes : CS1 to CS4 | 
| Supplementary Services | Number identificationCall forwarding (Call Divert)Call completionMulti PartyChargingCall barring | 
| Interface | Antenna Interfaces :RF connector support coaxial cableRF pads support RF cable soldering44-pin B2B connector including :UART/RS232SIM (1.8V/3V)General Purpose I/OsAnalog audio input/outputPower supply connectionAT command set according to GSM 27.05, 27.07 | 
| General Information | Dimension : 55.5 x 40 x 5.95 mmWeight : 15 gOperating Temperature : - 20 ~ + 60 °CFunctional Temperature :- 20 ~ + 70 °CStorage Temperature : - 40 ~ +85 °C |