SIM900D 规格参数
| Communications module type | GSM |
| Supply voltage | 3.4...4.5V DC |
| Manufacturer | SIMCOM |
| Data transmission | CSD, GPRS |
| Frequency | 1800MHz, 1900MHz, 850MHz, 900MHz |
| Standard | 2G |
| Module output power | 1W (class 1 @ DCS1800/PCS1900), 2W (class 4 @ GSM850/EGSM900) |
| Transfer rate | 85.6kbps |
| Interface | UART |
| Operating temperature | -30...80°C |