I have a pair of these:
https://www.amazon.com/Bluetooth-Headphones-Microphone-Sweatproof-Cancelling/dp/B072297ZXX/ref=sr_1_2?ie=UTF8&qid=1517091651&sr=8-2&keywords=ulko+bluetooth+headphones
Which I got as a gift.
They're fine. I was actually kind of surprised by the quality of them for the price. Decent noise cancelling (for earbuds), decent sound, decent battery life. Not sure how much I trust them to be sweat-proof though. I've been using them for a few weeks and they're working well, but I'm not sure that the build quality is too great. There's LEDs in the headphones to let you know when they're charged, and they leak light, meaning that there's cracks big enough for water to get into them. It hasn't been a problem yet, but it may be eventually.
They have pretty good range as well. When I'm at the gym I have a gym bag with me which my phone is in. Sometimes I'll be 25-30 feet away from my bag when I need to grab weights and the headphones stay connected at those ranges.
So, not the best headphones in the world, but I'm pretty impressed with them for $20. Since they're gym headphones I wouldn't want to buy anything too expensive. With these I wouldn't feel bad if they broke and I had to get a new pair.