F10 mini: The latest model with very good sound quality. Battery about 1.5-2 hours. Bluetooth connection is great
I7S new: The upgraded I7S model, with better high quality speaker and Bluetooth part, sound quality upgraded well and Bluetooth connection stable and strong. Price very cheap, costs effective
I9S IFAN: Upgraded Bluetooth part to have a better connection , stable and strong. Sound quality is acceptable .