Similar to the other review here, I got this speedcadence sensor as part of a combo kit with the computer. The sensor would sync upon the original pairing with the computer. If the sensor timed out and turned off, it would never wake up. No matter how i adjusted the magnets. Lyzene took both parts in for warranty service. They returned the computer and gave me a new sensor. Same issue. However, the computer works fantastic with other sensors. Pass on this sensor.
I got this as part of a bundle with the Super GPS, I have no complaints with the Super GPS. BUT the Speed and Cadence sensor is a piece of crap. It has stopped in the middle of rides on a couple of occasions, and will once again not connect. I wanted a cadence sensor to help me increase my speed, but I will look for a different product!!!