The impedance is 32 ohms. I got these for my elderly grandma who has swelling in her feet,so she needs a good sturdy shoe that doesnt hurt when her feet swell. Was fully happy with my purchase. I wanted something loud enough to fill my two car garage, while still sounding good. It is too small. Perfekt für den Sommer. Ive never in my life written an amazon review but im doing it now to tell you to buy these pants! Look there are almost 0 reason to actually go for wireless headset besides the fact that it has no wires. Great item at a great price Theyre super cute.