Lava Z40 features a 4.0-inch TN display with a screen Resolution of 400 x 800 pixels. The display is protected with Corning Gorilla Glass protection. The phone is powered by a 1.4GHz quad-core processor along with 1GB of RAM and 8GB of internal storage. The memory can be further expanded up to 64GB via microSD card slot.
| Type | FWVGA |
| Resolution | 400 x 800 pixels |
| Screen Size | 4 inches |
| Processor | Quad Core 1.4 GHz |
| Operating System | Android 8.1, Android 8.1 (Go edition) |
| RAM | 1 GB |
| Internal Memory | 8 GB |
| Expandable | 64 GB, microSD card |
| Rear Camera | 2 MP |
| Front Camera | 2 MP |
| Image Stablizer | No |
| Flash | Yes, Led Flash |
| Video Recording | Yes |
| Design | Bar |
| Size | 125.5 x 64.5 x 11.4 mm |
| Capacity | 2250 mAh, Li-ion |
| Type | Removable |
| Radio | Yes |
| Media Player | Yes, MP3/3GP/WAV/MIDI/AMR-NB/AAC/AAC+ |
| Video Player | Yes, 3GP/Flv/MP4/Mkv/Webm |
| Network | 2G |
| GSM/CDMA | GSM |
| Bluetooth | 4.0 |
| WiFi | Yes, Wi-Fi 802.11 b/g/n, hotspot |
| Internet | EDGE |
| GPS | With A-GPS |
| USB | Micro, 2.0 |
| HDMI | No |
| Headphone Connector | 3.5 mm |
| SIM | Dual |
| NFC | No |
| DLNA | No |
| Sensors | |
| Built in Applications | Yes, Google Play Store, Gmail Go, Youtube Go, Google Go, Google Assistant Go, Maps Go, Files Go, Whatsapp, Facebook Lite |