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The entire Bose Frames line, including the Tempo, the best-sounding Bluetooth audio glasses available, are down to $149, their lowest price ever.

Executive Editor David Carnoy has been a leading member of CNET's Reviews team since 2000. He covers the gamut of gadgets and is a notable reviewer of mobile accessories and portable audio products, including headphones and speakers. He's also an e-reader and e-publishing expert as well as the author of the novels Knife Music, The Big Exit and Lucidity. All the titles are available as Kindle, iBooks, Nook e-books and audiobooks.

Truth be told, we don't find that many great deals for Amazon Prime Day. But here's a good one: The Bose Frames Tempo Sunglasses are on sale for $149 , or $100 off their list price of $249 at major online retailers, including Amazon as part of its Prime Early Access Sale that runs through Oct. 12.

Read more: Best Bluetooth Audio Glasses and Sunglasses for 2022

The Tempo are sports sunglasses that feature the largest speaker drivers in the company's line of second-generation Frames audio sunglasses. The Frames Tenor and Soprano  make up the rest of the line, with both those models also discounted to $149 from their list prices of $249.

They're all essentially open headphones that pipe audio into your ears from directional speakers built into the glasses' frames, making them ideal for people who don't like to have anything in their ears while running or biking for safety reasons (or if you just don't like having earbuds jammed into your ears). 

If you're looking for the best-sounding pair of audio glasses with superior overall performance -- that includes call quality and battery life -- the Bose Frames Tempo are the one to get. As noted, they're ostensibly a sports model designed for runners and bikers, and while they're a little bulky, they stay on your head securely. They're also IPX4 splash-proof.

The Tempo offers slightly better sound and battery life than the more traditional-looking Tenor and Soprano (see below). The Tempo has better specs all-around, with USB-C charging and larger 22mm drivers. These Bluetooth sunglasses also deliver up to 8 hours of battery life. Bose sunglasses come with polarized lens and are prescription ready.

Their sound is definitely improved from the original Frames. Bose says the Tempo plays "deeper and louder -- loud enough for cycling at 25 mph -- while still able to hear traffic and your training partners." According to Bose, they're sweat-, weather-, scratch- and shatter-resistant, and they fit under most protective helmets. (I had no problem using them with a couple of bike helmets.) They also work decently for making calls, thanks to a new dual-microphone system (they can't block out all wind noise, however). Optional lenses are available for $39, and you can order prescription lenses through Lensabl and other online glasses companies that offer lens replacement . 

Whether this sale means that we'll see new Bose third-generation Bluetooth audio glasses soon, I can't tell you. But they are due for an upgrade after being released in 2020, and I hope Bose continues making new models. 

Read our Bose Frames review.