... mp3 player,mp3 digital player,mp3 players usb,sale mp3 player,usb mp3 player,mini clip mp3 player,shenzhen ... speaker,big speaker mp3 player,small screen mp3candy USB mp3 player,mp3 usbusb mp3 player support TF card ... the switch.2.When you charging connect USB by computer or charger,pls don't more than 4 hours ... will filled the electricity. 4.When you connect usb download from computer,don't more than 2 ...