What you need: Geek Pen, $30 

Risk level: Medium

If sneaking in your audio notes is a top priority, you should try a MP3 Pen. It’s just what it sounds like: a pen that can play audio files. The quality is not the best, and it’s not the most comfortable writing utensil, but unlike other multi-purpose pens, this one actually looks like a pen, which will help when getting it past your proctor. The only downside: there is no built-in speaker, you will need to use a pair of headphones. We suggest you combine an MP3 Pen with a Spy Headset.