Redmi 9 Activ mobile was launched on 24th September 2021. The phone comes with a 6.53-inch touchscreen display offering a resolution of 720×1600 pixels and an aspect ratio of 20:9. Redmi 9 Activ is powered by an octa-core MediaTek Helio G35 processor. It comes with 4GB, 6GB of RAM. The Redmi 9 Activ runs Android 10 and is powered by a 5000mAh battery. The Redmi 9 Activ supports proprietary fast charging.

As far as the cameras are concerned, the Redmi 9 Activ on the rear packs a 13-megapixel (f/2.2) primary camera, and a 2-megapixel (f/2.4) camera. The rear camera setup has autofocus. It has a single front camera setup for selfies, featuring a 5-megapixel sensor with an f/2.2 aperture and a pixel size of 1.12-micron.

The Redmi 9 Activ runs MIUI 12 is based on Android 10 and packs 64GB, 128GB of inbuilt storage that can be expanded via microSD card (up to 512GB) with a dedicated slot. The Redmi 9 Activ is a dual-SIM (GSM and GSM) mobile that accepts Nano-SIM and Nano-SIM cards. The Redmi 9 Activ measures 164.90 x 77.07 x 9.00mm (height x width x thickness) and weighs 194.00 grams. It was launched in Carbon Black, Coral Green, and Metallic Purple colours.

Connectivity options on the Redmi 9 Activ include Wi-Fi 802.11 b/g/n, GPS, Bluetooth v5.00, Infrared, USB Type-C, FM radio, 3G, and 4G (with support for Band 40 used by some LTE networks in India). Sensors on the phone include accelerometer, ambient light sensor, proximity sensor, and fingerprint sensor. The Redmi 9 Activ supports face unlock.