Oppo F1s is a very good phone which having low price with great features.The sound quality of these phone is very good and very clear.My brother having this phone and we used to listen music often times specially in car the sound quality through AUX in the car is very nice and clear, the Bass is so good.The size of these mobile is efficient and easy to carry in your pocket.As an Big phone it is worth to buy, speed of these phone is very good and never got hang that we usually see in mobiles often times.It is durable for future use and can get good value of money if we sell it in future and also most important for these days it is SELFIE Expert front and back both cameras are awesome.