| General | |
| Manufacturer: | BenQ |
| Model: | P51 |
| Year: | 2007 |
| Operating system: | Windows Mobile 5.0 PE |
| Capacity battery (MAh): | 1320 |
| Measurements | |
| Dimensions (mm): (width x height x thickness) |
60 x 122 x 20 |
| Weight (g): | 170 |
| Processor | |
| Processor Type: | Intel XScale PXA272 |
| Clock Frequency (MHz): | 416 |
| Memory | |
| Random access memory (RAM) (MB): | 64 |
| Read-only memory (ROM) (MB): | 192 |
| Communications | |
| Phone: | GSM 1800, GSM 1900, GSM 850, GSM 900 |
| Bluetooth: | 2.0 |
| Wi-Fi: | 802.11b,g |
| Other: | , GPRS |
| Multimedia | |
| Screen Size: | 2.8 |
| Screen Resolution (px): | 240 x 320 |
| Screen type: | TFT |
| Rear camera (Mp): | 1.3 |
| Flash: | Yes |
| Speaker: | mono |
| Output of earphones: | 2.5 |
| Management and input | |
| Touchscreen: | resistive |
| Buttons: | QWERTY-keyboard, navigation buttons, physical buttons |
| Extension | |
| Memory Cards: | MMC, SD |
| Additionally | |
| Operation time: (according to the manufacturer) |
4 hours of talk time |