writing this review after using it more then 4 months these headphones is really great i use this for my gym daily and day to day music the best this about this is its battery backup and sound i charge this once a week my daily usage is for 2 to 2 and a half hours my friends and people really loved this headphone some said they even have used higher range headphones of 7k brands like soni those even dont have this much bass and great sound it was best decision to purchase this hea