| Hardware and OS | Lava Z21 | |
| Operating System | Android v11 | |
| Custom UI | Android Go | |
| Processor | Octa core, 1.6 GHz | |
| Internal Memory | 32 GB | |
| External memory | Yes, Up to 256 GB | |
| RAM | 2 GB | |
| Display | Lava Z21 | other phones |
| Type | IPS LCD | |
| Size | 5.0 inches (12.7 cm) | |
| PPI /points per inch/ | 196 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | |
| Connectivity | Lava Z21 | other phones |
| 4G Bands | TD-LTE 2300(band 40) / 2500(band 41), FD-LTE 2100(band 1) / 1800(band 3) / 900(band 8) / 850(band 5) | |
| Network Support | 4G, 3G, 2G | |
| NFC | No | |
| SIM card | SIM1: Nano, SIM2: Nano | |
| SIM Slot(s) | Dual SIM, GSM GSM, Dual VoLTE | |
| Bluetooth | Yes, v4.2 | |
| GPS | Yes with A-GPS | |
| USB Connectivity | Mass storage device, USB charging, microUSB 2.0 | |
| VoLTE | Yes | |
| Wi-Fi | Yes, Wi-Fi 802.11, ac/b/g/n | |
| Camera | Lava Z21 | other phones |
| Main camera | 5 MP, Primary Camera, | |
| Camera Setup | Single | |
| Camera Features | Digital Zoom | |
| Flash | Yes, LED Flash | |
| Image Resolution | 2592 x 1944 Pixels | |
| Video Recording | 1280x720 @ 30 fps | |
| Selfie camera | 2 MP, Primary Camera, | |
| Multimedia | Lava Z21 | other phones |
| Headphone jack | 3.5 mm | |
| FM Radio | Yes | |
| Loudspeaker | Yes | |
| Design | Lava Z21 | other phones |
| Colours | Blue, Cyan | |
| Width | 73 mm | |
| Height | 146.5 mm | |
| Thickness | 10.4 mm | |
| Weight | 187 grams | |
| Battery | Lava Z21 | other phones |
| Capacity | 3100 mAh | |
| Type | Li-ion | |
| Removable | Yes | |
| USB Type-C | No | |
| Standby time | Up to 520 Hours(2G) | |
| TalkTime | Up to 23 Hours(4G) | |
| Other features | Lava Z21 | other phones |
| Fingerprint Sensor | No | |
| Other Sensors | Proximity sensor, Accelerometer | |
