I took it as a second headphone for the hall and as a headset. The first Sony xm4 are full size. They do not fall out of the ears even when running, the only thing is that sometimes (when worn for more than an hour) you need to correct them. When worn for more than 2 hours, discomfort sometimes appears. The charge is kept well, it is convenient to change the headphones in the headset mode, and the ears are not so tired and the headphones are charging.