It's disappointing to say the least, the RPM is measured by the speed sensor, it doesn't show the actual speed I'm riding at and the heart rate monitor is slowly picking up the true heartbeat and it shows that my heartbeat is always above 150-170 beats per minute. Any bike GPS you see is cheap, it's best to avoid. These cheap Chinese bike units don't offer the features and satisfaction you get when you buy them compared to Garmin 520 or Garmin 1030 plus which are better. I'm going to buy a Garmin 1030 Plus for $600-$800. Avoid that cheap China crap. The only thing I like about this Shanren is the big screen, the front light and the ability to detach it.
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