| Hardware and OS Redmi K40S |
| Operating system: | Android 12 |
| Processor: | Qualcomm Snapdragon 870 5G - 7 nm , octa-core (1x3.2 GHz Kryo 585 & 3x2.42 GHz Kryo 585 & 4x1.80 GHz Kryo 585) |
| GPU: | Adreno 650 |
| RAM: | 6GB / 8GB / 12GB |
| Internal Storage: | UFS 3.1 : 128GB / 256GB |
| Memory Card Slot: | No |
| User Interface: | MIUI 13 |
| Display Redmi K40S |
| Type: | AMOLED, 120Hz |
| Size: | 6.67" , ~86.6% screen-to-body ratio |
| Resolution: | 1080 x 2400p |
| Pixel Density: | ~395 ppi |
| Protection: | Corning Gorilla Glass 5 |
| Features: | Brightness: 1300 nits (peak) , 20:9 aspect ratio, HDR10 |
| Connectivity Redmi K40S |
| 4G Network: | 1, 2, 3, 4, 5, 8, 18, 19, 26, 34, 38, 39, 40, 41, 42 |
| 5G Network: | 1, 3, 5, 8, 28, 38, 40, 41, 77, 78 SA/NSA |
| Wi-Fi: | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct, hotspot |
| GPS: | A-GPS, GLONASS (1), BDS (3), GALILEO (2), QZSS (2), NavIC |
| NFC: | Yes |
| USB: | Type-C 2.0, USB On-The-Go |
| Speed: | HSPA 42.2/5.76 Mbps, LTE-A, 5G |
| SIM: | Nano SIM |
| Dual SIM: | Yes with dual stand-by |
| Wireless Charging: | No |
| Camera Redmi K40S |
| Main camera: | Triple: 48 MP, f/1.8, (wide), 1/2", 0.8 µm, PDAF, OIS, 8 MP, 119 (ultrawide), 2 MP, f/2.4, (macro), HDR, panorama |
| Features: | Dual - LED , Dual - tone |
| Selfie camera: | 20 MP, (wide) |
| Multimedia Redmi K40S |
| Loudspeaker: | Stereo speakers , 24-bit/192kHz audio |
| Radio: | No |
| 3.5 mm Jack: | No |
| Design Redmi K40S |
| Dimensions: | 163.2 x 76 x 7.7 mm |
| Waterproof: | Splash resistant |
| Weight: | 195g |
| Battery Redmi K40S |
| Capacity: | 4500mAh Li-Po, 67W fast charging, PD 3.0, QC 3 |
| Placement: | Non-removable |
| Other Redmi K40S |
| Sensors: | Side-mounted fingerprint, accelerometer, gyro, proximity, compass, color spectrum |
