These are the 10 best gadgets under $100

What's more pleasurable than upgrading an old, ailing piece of technology with something fresh and new? Or improving your life with a kind of gadget you've never before owned?

Unfortunately, we can't all upgrade our phones or laptops to the latest model. But there are plenty of devices that fall under $100 but still offer solid usefulness and quality. Here are 10 of our favorite examples.

Plantronics Backbeat FIT bluetooth earphones

These are, unquestionably, the best headphones for working out. And they have been for a long time. The FITs offer excellent sound quality without blocking out street noise on your run, they stay in your ears without tangling you up in wires, they let you take hands-free calls, and their batteries will last you through a week of workouts.

$82

Jabra MOVE Wireless Bluetooth Stereo Headphones

When you're not working up a sweat, the best affordable Bluetooth headphones we've seen are the Jabra MOVEs.

This a good-looking, good-sounding wireless device. Its battery will last you for about six hours of active listening, and it's so light that you'll forget its there. Tech Insider science editor Dave Mosher has a pair, and bought another for his dad — who reports that he hates to take them off.

$70

Microsoft Arc Touch Bluetooth Mouse

The computer mouse is not the first place you might look for exciting, innovative designs, but Microsoft's Arc Touch Bluetooth device is a big exception. It's been around for a little while now, but there still isn't a portable competitor that can match its elegance or convenience.

The Arc Touch runs on a single AAA battery, and lies flat in your bag. Ready to use it with your laptop or tablet? Press lightly in its middle and it pops into a sculpted bulge that'll fit easily in your hand, activating and connecting in the same motion. No more wasting batteries because you forget to flip a little switch.

$48