| Brand: | Siemens |
| Model: | A51 |
| Release Date: | 2004, Q4 |
| Display | |
| Resolution: | 101 x 64 pixels, 5 lines |
| Technology: | Monochrome graphic |
| Battery | |
| Capacity: | Removable Li-Ion 700 mAh battery |
| Type: | Li-Ion |
| Memory | |
| Expandable: | No |
| Body | |
| Dimensions: | 103 x 46 x 21 mm, 75 cc (4.06 x 1.81 x 0.83 in) |
| Weight: | 84 g (2.96 oz) |
| Connectivity | |
| Wifi: | No |
| Bluetooth: | No |
| Nfc: | No |
| Headphone Jack: | No |
| Network: | GSM |
| Colors: | Urban Grey |