This smart ring is my new go-to sleep tracker, is on sale for Presidents' Day, and is not by Oura

The Amazfit Helio ring aims to integrate a host of sleep metrics into your fitness ecosystem by syncing with your smartwatch. But there are a few caveats.

What's the deal? 

The Amazfit Helio Ring is on sale for $170 (save $30) during Amazon's Presidents' Day sale. That's 15% off on Amazfit's flagship smart ring. 

Also: The best Presidents' Day tech deals live now: Amazon, Walmart, Best Buy, and more

ZDNET's key takeaways

• The Amazfit Helio Ring is available now in two sizes for $299.99.
• It's comfortable, attractive, and syncs with Amazfit smart watches.
  
• The battery life only lasts four days, the Zepp smartphone software is confusing, and active heart rate readings were inaccurate in my testing.

As a fan of smart watches, I wear one on each wrist on a daily basis. But I don't like wearing watches to ...