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| GPS | 16-channel uBlox | 32-channel Sirf III | 16-channel uBlox |
| Transmission | GSM/GPRS | GSM/GPRS | Cellular Satellite |
| Voltage | 9-38 Volts DC | 5 Volts DC | 3.6 Volts DC |
| Battery | Lithium-Ion | Lithium-Ion | Lithium AA |
| Size (mm) | 115 x 114 x 43 | 98 x 48 x 19 | 1524 x 825 x 254 |
| Voice | Listen & Talk | Listen Only | - |
| Interface | RS232 | USB | RS232 |
| Input | 4 Digital | 1 Digital | - |
| Output | 1 Digital | - | - |