2 headphones from the start of the noise cancelling era! Both function on batteries Sound very well with cables and cases! One of the travel adapters is damaged, otherwise everything is in good condition as can be seen on the pictures. Cases show some spots and dents MDR 10RNC specifications Size & Weight Weight 7.23 oz General Features Usage Time 20 hours Cord Length 3.94 ft Magnet Neodymium Impedance (Ohm) Power ON 50 ohm, OFF 24 ohm (at 1 kHz) Plug Gold-plated L-shaped stereo mini Total Noise Suppression Ratio (%) 99.4% Frequency Response 6–24,000Hz Circum Aural Type Yes Cord Type Inline remote and microphone cord for smartphones Driver Unit 1.57 in dynamic – Dome type Closed Type Yes Wearing Style Over-ear, Headband Sensitivities (dB/mW) 101 dB/mW – Power on, 100 dB/mW – Power off MDR NC200D specifications Cord Connecting Cord (OFC) Sensitivity 103dB/mW (Power On), 102dB/mW (Power Off) Magnet Neodymium Diaphragm PET Battery Life 15hrs with alkaline battery Power Handling Capacity 50mW Plug L shaped stereo mini plug (Gold) Cord Length 1.5m Type Dynamic, Closed Frequency Response 8-23,000Hz Power Source / Battery Type DC 1.5V, 1 x AAA size battery Weight (Without Cord) Approx. 180g Impedance 68ohms at 1kHz (Power On), 35ohms at 1kHz (Power Off) Driver Unit 40mm, Dome Type