6 Reasons to Buy iSwing (1)Headphone Free: Connecting the 3.5mm acoustic wiring of the amplifier to MP3, iPod..etc. and listen it without headphone (2)Portable Party: Two-separated speakers design allows stereo effect and enhance sound performance (3)Share Music or Listen Prevately: The bag with speaker to share music or listen prevately (4)Music on the Move: music while walking, running, riding (5)iSwing in Multi-Functions: One set with backpack, straps+speakers, vest (6)Extra Feature: The zip compartment on the back with loads of packets for all your accessories