Very light, you can take it everywhere with you: at school, on holidays, in the car… You can adjust the size so that it fits perfectly on your head and listen to you music without disturbing anyone! Handy folding design: you can store it easily in your bag. Frequency response: 20Hz-20kHz. Impedance (acoustic resistance): 32 Ohm. Sensitivity of 85 dB to protect your hearing! Compatible with all audio and video players with a headphones jack output.