Livescribe Echo Smartpen The Livescribe Echo Smartpen allows you to record audio while you’re taking notes, and then play them back later. You can save and share interactive notes to your computer, iPad or iPhone via a micro-USB connector that also allows you to recharge your pen. The memory storage holds 400 or 800 hours of recorded audio, depending on the model, and includes an OLED display that makes it easy to navigate smartpen apps. Cost: Starting at $169.95