I have been thru several double wireless...they keep flying off my bikes. The first one flew off and I was able to gather up most of the pieces. The second one was during a race so it's gone. The 3rd one I am waiting on to be credited towards something else- likely Polar. PS did the Ciclo Sport Hac4 route prior to the Cateye and went thru 2 of those too. I think they all bug in one way or another.