Review on YS Wireless Waterproof Bicycle Speedometer & Odometer With LCD Display & Multi-Functions - Track Your Ride! by Keyone Brownlee

Bought this for my 10 yr old as he is so eager to see how fast he can ride his bike!Somewhat difficult to mount the sensor/magnet. Its a slick rectangle piece of plastic that you are trying to mount on round forks with two little holes for the zip ties instead of four. hmm, seems like there could be some better engineering there IMO? Also, the magnet if you have single spokes can be difficult to mount and securely fasten as its just a screw type to mount and to try to get within the 3mm specs. I really had to play around with it some but feel I will need to make constant adjustments and confirm every few rides its secure.The readout is ok but within minutes the backlit green display stopped working of course. But my son is happy he can look down and see his speed, top speed, distance, etc. It even has the temp and a clock on there so I can tell him to come back home at a certain time now. :-}All in all its ok but I didn't expect a whole lot for $20 but at the end of the day, my son is happy knowing how fast he can go now. :-)