Designed for on-the-go musicians seeking lightweight headphones, these Yamaha RH1C portable headphones deliver remarkable acoustic presence and full, bright sound through an advanced dynamic range and open-ear design. Finished with comfortable ear cushions, the economic RH1C is the perfect accessory for portable personal systems. Frequency Response: 20 Hz - 20 kHz, Impedance: 32 ohms, Sensitivity: 91 dB/mW, Jacks: 1/8" Plug and 1/4" Adaptor, 8' Cord