AKG K 340 K340 In-Canal HIGH PERFORMANCE Headphone -Black -With volume control We found that when the volume control is adjusted, there is some noise similar to radio adjustment, but there is no such noise when listening to music. About this item Premium quality closed design In-Ear earphones. Comfortable wear, iPhone compatibility, recommended for DVD, CD or even MP3 players. Its soundscape is balanced and clear, both low and high tones are perfectly audible, so you get a sound with approximately monitor clarity. Its deep effect can be enhanced by sealing the ear canal as well as possible. Its cable has a built-in volume control, which is not only practical but also a decorative element of the earphones. Design: closed Frequency transmission: 11.5Hz - 23 kHz Sensitivity: 122dB SPL/V Impedance: 16 Ohms Power: 20mW Net weight (without cable): 3g Cable length: 1m Connection: 3.5 gold-plated Jack