The Urbanears Medis with EarClick technology is the most functional piece in the Urbanears family. The EarClick is a patented technology that gives the user the best of both worlds: the size and convenience of an in-ear paired with the comfort, safety and health benefits of an over-ear. The inner piece of the earphone has two rubber pieces, one fixed on the lower end and one interchangeable earpad at the top of the earphone. This allows the "Medis" to click into your OUTER ear and stay in place with exceptional strength, great comfort and still allow for great sound. Since the earphone does not plug into your ear like most in-ears it allows you to still hear your surroundings. The cable is made of tonal fabric and it holds the microphone/remote unit.Driver Unit: 9mmFrequency Resp: 12-22kHzImpedance: 32vSensitivity: -105db /-3mmMax Input Power: 5mwWeight: 22gCord Length: 47 inches