1.Weight: 13g 2.Material: ABS 3.Memory card types: SD card 4.Memory Size: 128MB-8GB 5.Expansion CARDS: support 6.Mode of operation: button 7.Color:optional 8.Playing time: about 8h 9.Music form:MP3/WMA 10.Screen: No 11.Function: FM Radio, Support Card 12.Output frequency: 20Hz to 20KHz 13.S/N ratio: 85dB