| Brand: | Karbonn |
| Model: | KT21 Express |
| Release Date: | 2012 |
| Display | |
| Size: | 2.8 inches, 24.3 cm2 |
| Resolution: | 240 x 320 pixels, 4:3 ratio |
| Technology: | TFT |
| Camera | |
| Main Specs: | 3.15 MP |
| Main Features: | LED flash |
| Main Video: | Yes |
| Battery | |
| Capacity: | Li-Ion 1000 mAh, removable |
| Type: | Li-Ion |
| Memory | |
| Expandable: | microSDHC (dedicated slot) |
| Body | |
| Dimensions: | - |
| Weight: | - |
| Connectivity | |
| Wifi: | No |
| Bluetooth: | 2.0 |
| Nfc: | No |
| Usb: | microUSB |
| Headphone Jack: | Yes |
| Network: | No cellular connectivity |
| Sensors: | Proximity |
| Colors: | Black |