1.Sound Cylinder Speaker 2.Stereo sound quality 3.Can be used with mobilephone,all device with 3.5mm 4.In stock Portable Sound Cylinder Speaker Instructions:1, battery: internal lithium polymer batteries, when using USB power supply, you can play music while charging.2, LINE IN: audio input3, on display: digital display4, support TF card USB MP3 player5, OFF/ON: switch on OFF sound off, put ON ...