Designed for on-the-go musicians seeking a lightweight headphone, RH1C delivers 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. Other features include: 98 dB/mW of sensitivity; 32 Ohms of impedance; 20 Hz-20 kHz of full-spectrum frequency response. Includes 8', oxygen-free copper cord with 1/8 inch. plug and 1/4 inch. adaptor.