Once you figure out that the red or blue LEDs represent cadence and speed sensor settings, these little guys work fine. I use a set (one as a speed sensor, one as a cadence sensor) with a Garmin 810 GPS navigator. It works well and is less than $20 each. After about 6 months, the rating changes to 5 stars. I had to change the batteries in the sensors once, but they worked fine for over 1,700 road miles on my bike. Great, reliable device. I bought a cheap Fluid Trainer for the winter, added an ANT+ module ($15) to my Windows PC, and those sensors got me working on Zwift!
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