HIFI means high fidelity, and it does not have a standard, a $1 headset, as long as its tuning orientation is as restore as possible, that is HIFI, and no matter how expensive the game headset, obviously is unrelated to HIFI. Bluetooth headphones are limited by this transmission method of Bluetooth, as well as the cost problem, so in general, the sound quality will be several grades worse than the headphones of the same price, so if it is for sound quality, it is not recommended to consider Bluetooth.