The stereo headphones - MDR-XB600 Sony we have at the Fire HD7 (4th generation) connected and listened to music. The sound of the bass is overwhelming. You get the feeling, you're in a concert hall. The earpieces have a diameter of 7.5 cm and are good at and can be folded. This mechanism, which is handy if you are traveling, for example, you have to practice a few times, but is not a problem. The flat headband is padded and not suppressed. The arc length can be adjusted well, depending on head size. The connection cable is flat and very mobile. In the cable there is no switch is. The volume must be adjusted to the playback device. Collapsed results in a width of 15 cm, a height of 12 cm and a depth of 7.5 cm (earpiece). We are pleasantly surprised with this headset.