The ones who say the volume is ungnügend, are either completely deaf or have not plugged the set right ear. My ears are a bit compromised because I was young when I often heard music too loud. In some songs that were recorded at high volume, the lowest level is even too loud to me. Is recognized immediately on all devices, is very well located in the ear, sound quality is also very good, very practical for Internet radio listening, thanks to A2DP. Absolute buy recommendation.