Best Wireless Bluetooth Sports Headphone for Under $40?

I was looking for a wireless Bluetooth headset to wear while riding a bike. Sick of the wires and earbuds constantly getting in the way and falling out, I figured I'd check Amazon for an inexpensive option. What I found, was the Senso Bluetooth Headphones.
 
Now, they happen to not only be the number one best seller on Amazon in the Bluetooth Headset category but they also have over 19,000 reviews with a 4.5 star average, which is insane. On top of that, they're under $40. With all that, they have to be good, right?

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