| Local Name | Redmi Note 9S |
| Technology | GSM / HSPA / LTE |
| 4G Bands | 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40 |
| 3G Bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
| 2G Bands | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A |
| Announced | 2020, March 23 |
| Status | Available. Released 2020, April 7 |
| Dimensions | 165.8 x 76.7 x 8.8 mm (6.53 x 3.02 x 0.35 in) |
| Weight | 209 g (7.37 oz) |
| Build | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame |
| SIM | Dual SIM (Nano-SIM, dual stand-by) |
| Body | Splash-proof |
| Display Type | IPS LCD capacitive touchscreen, 16M colors |
| Screen Size | 6.67 inches, 107.4 cm2 (~84.5% screen-to-body ratio) |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~395 ppi density) |
| Protection | Corning Gorilla Glass 5 | 450 nits typ. brightness (advertised) |
| OS | Android 10.0; MIUI 11 |
| Chipset | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| CPU | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| GPU | Adreno 618 |
| Card Slot | microSDXC (dedicated slot) |
| Internal Memory | 64GB 4GB RAM, 128GB 6GB RAM | UFS 2.1 |
| Camera Features | HDR, panorama |
| Video | 1080p@30fps |
| Loudspeaker | Yes |
| 3.5mm Jack | Yes |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Bluetooth | 5.0, A2DP, LE |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS |
| Infrared Port | Yes |
| Radio | FM radio, recording |
| USB | 2.0, Type-C 1.0 reversible connector |
| Sensors | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass |
| Battery | Non-removable Li-Po 5020 mAh battery |
| Colors | Aurora Blue, Glacier White, Interstellar Gray |
