The ergonomic design of the Eartips on the JVC Xtreme Explosives HA-FX1X earbuds, made of soft silicone, ensure extreme comfort for users as they enjoy their music. These in-ear headphones contain a 2.6 mm-thick cable made of pure copper, measuring at 3.9 feet in length, with a gold-plated 3.5 mm plug that is compatible with iPods, iPhones, and iPads. These JVC Earbuds have an impedance of 16 ohm, with a frequency response range beginning at 5 Hz and reaching all the way to 23 kHz. With a sensitivity of 104 dB, the listener is assured that he or she can listen to music with the JVC Earbuds at a low, safe volume without sacrificing quality, as opposed to earphones with low sensitivity, which force users to pump the volume to dangerous levels just to hear all the notes in a song. The bass ports on these in-ear headphones deliver deep, booming bass.