Brand: VIVO Model Name: Y91 CPU: Octa-core 2.0 GHz Cortex-A53 Chipset: MediaTek Helio P22 (MTK6762R) GPU: PowerVR GE8320 650MHz Memory: RAM- 2GB LPDDR3 | ROM 64GB External Memory Support Up to 256GB Display: Screen size 6.22 inches IPS, LCD HD+ Display (1520 x 720 Pixels) Battery: Non-Removable 4,030 mAh Lithium-Polymer SIM: Dual SIM (Nano-SIM + Nano-SIM) Sensors: Proximity, Light, Accelerometer, Compass, Gyroscope, Fingerprint Operating System: Funtouch 4.5 OS (Android 8.1 Oreo) Camera: 13MP f/2.2 + 2MP f/2.4 with LED and AF Dual Rear Camera | 8 Megapixel f/2.0 Front camera 1 Year Warranty