Beautiful headphones "behind the ears" with a closed construction, 1.25 m long detachable cable that can be replaced. There is a controller on the cable with an integrated microphone and a function for receiving calls or switching songs. A 3.5 mm curved jack connector is used for connection. Quality music reproduction is provided by a 10 mm dynamic transducer in combination with a 6.8 mm electret electrostatic transducer, which is based on the opposite principle of electret microphones. The electrostatic converter is more sensitive and has a better ability to reproduce details. The headphones have an impedance of 25 Ohm and a sensitivity of 103 dB / mW. KZ ZEX are ergonomically shaped, so they fit perfectly in the ear and silicone extensions ensure that they will also hold great.