Apple iPod nano 4GB, Silver, iPod nano. Player media type: flash-media, Total storage capacity: 4 GB. Display diagonal: 50.8 mm (2 "), Display resolution: 320 x 240 pixels. Audio formats supported: AAC, AIFF, MP3, WAV, Video formats supported: H.264, MOV, Image formats supported: BMP, GIF, PNG. Headphone connectivity: 3.5 mm. Frequency response: 20 - 20000 Hz, Impedance: 32 Ом