Review on XOSS X1 Bike Speed and Cadence Sensor: Wireless Bluetooth 4.0 Computer for Accurate Bicycle Speedometer (2 Pack) by Dexter Rasberry

I bought these to use with a classic bike trainer to use Zwift. The instructions don't say anything, so you'll have to go back to the images in the list to find out which color corresponds to speed or cadence, and set them accordingly. Once this is figured out, they should connect to zwift a few seconds after battery installation. For some reason it only recognized cadence and not speed, so I pulled out both batteries and changed the speed to cadence and it worked right away. I've only been using it for a few days but so far so good. If you want a cheap Zwift setup, grab the shoes on letgo or craigslist for $30, buy them and you're good to go! Highly recommended