great sound . I find it a little difficult to setup without instruction\/manual -lrb- my set do not come with any -rrb- . once I find the right connection , it be perfect at any frequency I select . I once have they on for over 4 hour and battery do not die . it fit my head just fine and you can adjust the length . after look for day and price checking for the best , I be extremely satisfy with these headphone .