Redmi 9 Activ comes with a 6.53-inch HD+ display with 720×1600 pixels resolution with 400 nits brightness, 70% NTSC colour gamut. The phone is powered by an octa-core MediaTek Helio G35 SoC, paired with up to 6GB RAM. There are 64GB and 128GB of onboard storage options with external storage of up to 512GB via a microSD card card slot.
For the camera, it is equipped with a dual rear camera setup with a 13-megapixel primary sensor with an f/2.2 lens and a 2-megapixel depth sensor with an f/2.4 lens. The front camera features a 5-megapixel selfie camera sensor with f/2.2 lens at the front.
The Activ variant also runs Android 11 with MIUI 12 on top. It packs a 5,000mAh battery with 10W charging support. The phone has a rear-mounted fingerprint scanner.
| Status | Launched |
| Launch Date | 23 September, 2021 |
| Price (₹) | 9,499 |
| Memory Variants | 4/64 GB, 6/128 GB |
| Colour Options | Pearl Blue and Crystal Black |
| Front Protection Glass | N/A |
| Device Back | N/A |
| Screen Size (Inches) | 6.53-inch HD+ display |
| Screen Type | IPS LCD |
| Screen Resolution | 720 x 1600 pixel |
| Screen Aspect Ratio | 20:9 |
| Refresh Rate | 60 Hz |
| Touch Sampling Rate | 60 Hz |
| Pixel Density (PPI) | 269 |
| Chipset | MediaTek Helio G35 |
| Phone RAM | 4 GB, 6 GB |
| Phone RAM Type | LPDDR4 |
| Storage Capacity | 64 GB, 128 GB |
| Storage Type | eMMC 5.1 |
| Memory Card Slot | Yes, Dedicated Slot |
| OS & UI | MIUI 12 based on Android 11 |
| Rear Camera Module | Triple |
| Rear Camera Specs | 13-megapixel (f/2.2) + 2-megapixel (f/2.4) + 2-megapixel (f/2.4) |
| Front Camera Module | Single |
| Front Camera Specs | 8-megapixel (f/2.0) |
| Battery Capacity (mAh) | 5000 |
| Fast Charging | |
| Charging Speed | 10W charging |
| Wireless Charging | |
| Reverse Charging |
| Supported Networks | 4G/LTE |
| SIM Slots | Dual (nano) |
| Bluetooth | v5.0 |
| Wi-Fi | Yes |
| USB Port | USB Type-C |
| NFC Chip | |
| Supported GPS | AGPS, GLONASS, BeiDou |
| 3.5 mm Audio Jack | |
| Set of Speakers | Mono |
| Face Unlock | |
| Fingerprint Reader | Rear Mounted |
| IR Blaster | |
| Sensors | Accelerometer, Ambient Light, Fingerprint, Proximity |