Be it AAC, Protected AAC, MP3, MP3 VBR, Audible, WAV, or AIFF audio format, the 2G iPod shuffle plays it all and keeps you entertained on the go. With 1GB memory capacity, this green iPod shuffle lets you store up to 240 music tracks. The clip-design of this Apple media player makes it wearable on your t-shirt sleeve when you are out jogging or working out. With a sleek design and weighing just 0.55 ounce, this green iPod shuffle is easily portable. When completely charged, the rechargeable lithium polymer battery of this Apple media player, offers up to 12 hours of continuous playback. With 20Hz to 20,000Hz frequency response rate, the 2G iPod shuffle offers crystal clear responses.