Specifications: Signal to noise ratio: 85dB Distortion rate: 1% Speaker specifications: 57MM*1 Play time: 4.5 hours Battery capacity: 1200MMH with protective case Function: support TF card U disk 1+1 series Socket: 3.5mm audio jack TF card socket V8 port Package List: 1 * Speaker 1 * USB interface + Audio interface cable 1 * Lanyard 1 * User Manual