Apple iPod shuffle 4GB Black, iPod shuffle. Player media type: flash-media, Total storage capacity: 4 GB. Audio formats supported: AIFF, WAV. Headphone connectivity: 3.5 mm, Headphone frequency: 20 - 20000 Hz. Continuous audio playback time: 10 h, Battery technology: Lithium Polymer (LiPo). Weight: 10.7 g