Oppo

5.2 inch Display
Android 7.1 Nougat Operating System
Octa-core 1.8 GHz  processor
up to 256 GB memory card slot
16 GB Internal Memory
2 GB RAM
13 MP Rear Camera
5 MP Front Camera
Non-removable Li-Ion 3000 mAh battery

5.5 inch display
Android 6.0 Marshmallow Operating System
Octa-core 1.5 GHz Processor
up to 256 GB Memory Card Slot
64 GB Internal Memory
4 GB RAM
13 MP Rear Camera
Dual 16 MP 8 MP Front Camera
Non-removable Li-Ion 3200 mAh battery

• 6.0″ inch display
• 2.5GHz Octa-Core processor
• 6GB RAM
• 64GB ROM
• 16MP Rear camera
• 20MP Front camera
• 4G LTE
• 3200mAh battery

• 6.42″ inch display
• 2.8GHz Octa-Core processor
• 8GB RAM
• 256GB ROM
• Dual 16MP+20MP  Rear camera
• 25MP Front camera
• 4G LTE
• 3730mAh battery