Apple iPod touch 16GB 4th Generation - Black (Refurbished) Apple iPod touch 4 Generation are up-gradable to to 6.1.6.To update via iTunes please install iTunes 10.7. Support for AAC, Protected AAC (iTunes Store), MP3, MP3 VBR, Audible, Apple Lossless, AIFF, and WAV audio formats; H.264, MPEG-4, and Motion JPEG video codecs in M4V, MP4, MOV, and AVI formats For any charger issues, please make sure the product is charged with a certified charger for 24 hours before first use. In addition, please make sure that you are charging from a wall socket, and not from a USB port. Both will help in facilitating a quicker charge time. About 4 hours (2-hours fast charge capacity) 3.5-inch TFT LCD display, 960-by-640-pixel resolution (326 pixels per inch). Bluetooth 2.1 and EDR 32 GB Storage Capacity (Estimated Space 28.3 GB) capacity for about 8,000 songs, 40,000 photos, or 40 hours of video; Up to 40 hours of audio playback or 7 hours of video playback on a single charge