1. with usb/sd/TF card 2.heavy bass 3.MOQ:50pcs Features:Compact and lightweight.Mini digital audio with unique appearance and black colors.Aluminum diaphragm micro-speaker, insure the sound quality.Circular design, exquisite appearance, with 6 buttons.Buttons definition: "MODE", "Stop/Pause","EQ". "Back/volume down", "Next/volume up", "ON/OFF"Ports including: 3.5mm stereo port, Micro SD, USB( ...