Maximo iMetal Lightweight Hi-Fi High Fidelity Noise Sound Isolating Isolation Cancelling/Canceling In Ear Stereo Earphones Earbuds Headphones for MP3/iPod/iPhone/PDA with 2.5mm Plug Adapter/Carrying Case Superior audio fidelity and deep, powerful bass for iPod, MP3, Smartphone, PDA and air travel. Lightweight alloy metal headphones with 3 sizes of eartips for snug, comfortable fit and a stylish carrying case. 4-foot cable length and 2-foot extensionable cable for extra length Drivers: 9mm Neodymium; Frequency response: 18Hz-22KHz; Sensitivity (1KHz, 0.1V): &gt;100dB Maximum SPL output: &gt;120dB ; Connector: 3.5mm stereo plug