Salam friends.muje thori technical help chahye wo ye k aj kal market mein jo woofers available ha aun mein Usb attach ho jati ha. E.g ye woofer pc se attach nhi han ab agr mein aun mein koi usb lgata hon aur aus usb mein total 10 songs han aur mei ne 5th song lgaya hoa ha 5th song total 7 mint ka ha aur song 3 mint tak play ho chuka ho ab agr mein woofers ki power direct of kr deta hon ap yun samjh len k light chali gyi ha usb aun mein attach he ha jb power aye gi tu 5th song start se play hota ha na k aus time pe jahan pe light gyi thi mein ne kafi woofers try kiye han sab k sath aesa he hota ha. Mp3 player jo market mein available han aun mein battery ka backup hota ha but muje aesi koi chez chahye jo direct power he se chale but song ya koi bhe chez wahan he se play kare jb direct power off ki ho. but ma ne aik chez note ki ha k Car mein jo cd player hota ha aus mein usb me song wahan se play hota ha jahan se cd player or car ka switch off kr k on kren.