| Brand | Walton |
| Model | Olvio ML21 |
| Device Type | FeaturePhone |
| Release Date | 01 January 2021 |
| Status | Available |
| Operating System | FeaturePhone |
| Display Type | QVGA |
| Screen Size | 2.4 inches (6.1 cm) |
| Resolution | 240x320 px |
| Camera Setup | Single |
| Resolution | 1.9 MP, Primary Camera |
| Flash | LED Flash |
| Image Resolution | 640 x 480 Pixels |
| Video Recording | Yes |
| Height | 124.5 mm |
| Width | 53 mm |
| Thickness | 13.5 mm |
| Build | Back: Plastic |
| Colors | Blue, Black, Red |
| Battery type | Li-Ion (Lithium Ion) |
| Capacity | 1000 mAh |
| Placement | Removable |
| Expandable Memory | Up to 16 GB |
| Network | 2G |
| SIM Slot | Dual SIM, GSM+GSM |
| SIM Size | Mini-SIM, dual stand-by |
| GPRS | Available |
| Bluetooth | v2.0 |
| USB | microUSB 2.0 |
| FM Radio | Yes |
| Loudspeaker | Yes |
| Alert Types | Vibration, Ringtones |
| Audio Jack | 3.5 mm |
| Video | MP4 |
| Made By | Bangladesh |
| Features | Facebook, Blacklist, Whitelist |
