Great concept but unfortunately had to be returned. Sound The sound quality when making calls was not acceptable. It seems that the conversation took place in a large corridor with barely perceptible echoes. It hasn't changed by changing the phone settings. With a different Bluetooth set, callers could be heard and understood much better. Music fidelity was good and sufficient. Comfort The headphones were comfortable but fell out no matter what size ear tip was used. They are by no means an effective training solution. Overall, the quality and fit are the biggest critics. If you just want to sit and listen to music they are acceptable. If you want to get more use out of it, buy another pair.
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