Oppo A91 was announced in December 2019 which sports a 6.4-inch AMOLED display with a screen resolution of 1080 x 2400 pixels.
Oppo A91 is powered by a Octa-core (4×2.1 GHz Cortex-A73 & 4×2.0 GHz Cortex-A53) with Mediatek MT6771V Helio P70 (12nm) chipset coupled with 8GB of RAM and 128GB of internal storage. It also supports an external memory card with up to 256 GB microSD. The device came out of the box with Android 9.0 Pie under ColorOS 6.1 and backed by a 4030 mAh battery (Non-removable).
As far as the camera concerned, the device has a Quad-camera setup with 48MP + 8MP + 2MP + 2MP primary sensors and a selfie camera with an 16MP lens. Other connectivity option includes 4G-VoLTE, GPS, Glonass, Bluetooth, Mobile Hotspot, accelerometer, gyroscope, proximity sensor, and compass. etc. The Oppo A91 come with a face unlock feature.