SkullCandy CRUSHER GRAY/CYAN/BLACK S6SCGY-381 These headphones feature a built-in power amplifier in the housing to enjoy bass vibration. Please consider this a complete junk item, assuming parts replacement or repair is necessary, as there are scratches and deterioration of the ear pads. Please refrain from purchasing if you are sensitive to imperfections. Includes: Main unit, included cable, bag, and box. Driver: 40 mm + Sansation55 Driver Impedance: 32Ω Sensitivity: 102dB/mW Maximum Input: 100mW Frequency Response: 100〜18,000Hz Series/Model...SKULLCANDY Series Connection Type...Wired Structure...Sealed/Closed-back