Stylish Sport Headphone Mp3 Player Support Max 8GB TF Card Black + Green Audio formats: MP3/WMA/WAV, Capacity: support max 8GB TF card S/N ration: ?86dB, Output frequency: 20Hz-20HKz Battery: Li-Po battery, USB: USB2.0 Operation system: windows 98/2000/XP Playtime: music playback up to 6 hours, Working temperature: -10  45 degree