Axxion KITTY4. Player media type: flash-media, Total storage capacity: 4 GB. Audio formats supported: WMA/MP3/WAV. Headphone connectivity: 2.5 mm. Continuous audio playback time: 6 h, Battery technology: Lithium-Ion (Li-Ion). Compatible operating systems: Windows ME/2000/XP Mac OS 10 Linux 2.4.2, Standard interfaces: USB