| Local Name | Redmi Note 9 4G |
| Technology | GSM / CDMA / HSPA / LTE |
| 4G Bands | 1, 3, 5, 8, 34, 38, 39, 40, 41 |
| 3G Bands | HSDPA 850 / 900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | CDMA 800 |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A |
| Announced | 2020, November 26 |
| Status | Available. Released 2020, November 26 |
| Dimensions | 162.3 x 77.3 x 9.6 mm (6.39 x 3.04 x 0.38 in) |
| Weight | 198 g (6.98 oz) |
| Build | Glass front (Gorilla Glass 3), plastic frame, plastic back |
| SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Body | Water-repellent coating |
| Display Type | Li-Po 6000 mAh, non-removable |
| Screen Size | 6.53 inches, 104.7 cm2 (~83.4% screen-to-body ratio) |
| Resolution | 1080 x 2340 pixels, 19.5:9 ratio (~395 ppi density) |
| Protection | Corning Gorilla Glass 3 |
| OS | Android 10, MIUI 12 |
| Chipset | Qualcomm SM6115 Snapdragon 662 (11 nm) |
| CPU | Octa-core (4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) |
| GPU | Adreno 610 |
| Card Slot | microSDXC (dedicated slot) |
| Internal Memory | 128GB 4GB RAM, 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM | UFS 2.2 |
| Camera Features | LED flash, HDR, panorama |
| Video | 1080p@30fps |
| Loudspeaker | Yes, with stereo speakers |
| 3.5mm Jack | Yes |
| Sound | 24-bit/192kHz audio |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Bluetooth | 4.2, A2DP |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS |
| NFC | No |
| Infrared Port | Yes |
| Radio | FM radio |
| USB | USB Type-C 2.0, USB On-The-Go |
| Sensors | Fingerprint (side-mounted), accelerometer, proximity, compass |
| Colors | Gray, Green, Blue, Orange |
