O-tus Bluetooth Mini Speakers ($75)

I am an avid bicyclist, and I've found that when I listen to music while I'm riding I can go farther and faster. However, wearing earbuds isn't a safe option because I can't hear cars behind me on the road or other bikers if they wish to pass me on the trail. The O-tus Bluetooth Mini Speakers take care of that problem. They fit under your helmet (skateboard helmets too) and rest just above your ears so you can hear your music while also tuning into your surroundings. They come with a Bluetooth remote control that attaches to the back of your helmet and a chain lanyard and clothing clip for another listening option. Talk time is up to three hours with 130 hours of standby.