The sound quality about this oppo f1s is excellent. Easy to use for this fingerprint sensor for unlock this phone. Different different fingers can be use for open different apps of your phone. best camera quality, the selfie camera(front camera) is better than vivo v5 or vivo v5 plus phones. Actually this phone is the real Camera phone about this 16 megapixel Front facing camera and 13 Megapixel Real Camera which has HDR more is best. Smoothness to use there screen quality and battery backup point is 9 out of 10.