Nilox Clip Tube 4gb. Player media type: flash-media, Total storage capacity: 4 GB. Audio formats supported: MP3 VBR, WAV. Headphone connectivity: 3.5 mm. Continuous audio playback time: 6 h, Battery technology: Lithium-Ion (Li-Ion), Battery recharge time: 2 h. Connectivity technology: Wired, USB cable: USB, Standard interfaces: USB