The Green Lion GL-Stereo Pro Wire Control with Microphone is designed to produce sound with excellent quality, with a frequency response of 20Hz to 20KHz and sensitivity of 98dB ± 3dB, providing clear and balanced sound. This headset has a 10mm speaker with an impedance of 16? ± 15%. A rich, audible sound is perfect for most activities. Pick up for a hand-free call with the built-in mic and the flexible cable, at 1.2m long, gives this headset the right kind of flexibility for comfortable use, with a 3.5mm audio jack, compatible with a wide range of devices making it easier to connect. The Green Lion GL-Stereo Pro combines quality performance with ease of use, all in a stylish black design, ideal for music and calls. Specification ?Speaker Sensitivity: 98dB ± 3dB Frequency: 20-20KHz Impedance:16? ± 15% Speaker: 10mm Features Built-in Mic 1.2m Cable Length 3.5mm Audio Jack