| Manufacture | BenQ-Siemens | Sony Ericsson |
| Model | P51 | Xperia X1 |
| Form factor | Block | QWERTY Slider |
| Weight | 170 gram | 158.00 |
| Dimensions (HxWxD) | 122 x 60 x 20 | 110.50 x 52.60 x 17.00 |
| Operating System | Other | Windows Mobile |
| Networks | 2G - 900/1800
| 2G - 850/900/1800/1900
3G - 900/1900/2100 |
| HSCSD |  | |
| GPRS |  | |
| EDGE | | |
| UMTS | | |
| HSDPA | | |
| HSPA+ | | |
| WiMAX | | |
| LTE (4G light) | | |
| WLAN / Wi-Fi | | |
| Wi-Fi Hotspot | | |
| Wi-Fi Direct | | |
| SMS | | |
| MMS | | |
| Email | | |
| HDMI out | | |
| USB port | | |
| MHL | | |
| Bluetooth | | |
| Bluetooth version | NA | NA |
| DLNA | | |
| GPS | | |
| Glonass | | |
| ANT+ | | |
| IrDA | | |
| NFC | | |
| 3.5 mm audio connector | | |
| Camera | | |
| Camera resolution | 1.3 Megapixels | 3.2 Megapixels, 3x digital zoom, autofocus |
| Image Stabilization | | |
| BSI sensor | | |
| Camera Flash/Light | | |
| Flash type | NA | NA |
| Video recording | | |
| Video capture resolution | NA | NA |
| Second Camera | NA | VGA (640 x 480) |
| Display size | 2.8 inches | 3.00 |
| Touchscreen | | |
| Colour display | | |
| Number of colours | 65536 | 262144 |
| Display width | 240 | 480 |
| Display height | 320 | 800 |
| PPI | 142.86 | 310.98 |
| Second Display | NA | 320 x 240 |
| CPU | NA | NA |
| GPU | NA | NA |
| Memory | 128 MB, 128 MB Flash | 400 MB |
| Micro SIM | | |
| Dual SIM | | |
| MP3 | | |
| Ringtones / Music file format | Polyphonic 64 voices | MP3 |
| Java | | |
| Games | Yes | 3 |
| FM Radio | | |
| Battery | Li-Ion 1370 mAh | 1500 mAh |
| Standby time (h) | 150 | 500 |
| Talktime (m) | 240 | 600 |
| Wireless Charging | | |
| Browser | 2.0 | 2.0 XHTML, HTML, Opera, P |
| Calendar | | |
| Voicedialing | | |
| IP Code | NA | NA |
| Predictive text | | |
| RSS reader | | |
| Voicememo | | |
| PC Synchronization | | |
| SyncML | | |
| Website | Website | Website |
