SPGOOD Bike Computer Wireless 21 Functions Waterproof with Backlit Display,Automatic Start/Stop & Automatic Storage Bike Speedometer,Black Bicycle Computer

great product for the price. attach magnet to wheel. put supplied batteries into display unit and magnet sensor. attach magnet sensor to front fork aligned with magnet attached to spoke using supplied cable ties. attache display unit to handlebars using supplied band.configuration is easy. as soon as battery is connected the display unit asks for wheel circumference. this can be taken from the lookup table supplied with the computer (tyre size -> circumference in mm). This is very accurate anyway. You can always simply measure the circumference of the tyre yourself if in doubt and enter that. Then you're asked for Miles / KM selection. Once set you're ready to go.The current time can be set by pressing and holding "S" button on the time screen.Really useful feature is setting the odometer. I've already done some miles on a new bike before I received this but can set that into the odometer before riding with the computer so all the miles are displayed and not just ones from when I put the computer on. Very nice feature.Only downside is there's no explanation in the instructions about resetting the circumference of the wheel or KM / Miles selection again after the first time. Put the unit into a mode, say odometer and hold down BOTH "S" and "M" buttons until you're in the circumference selection setting again. Be mindful here that if you want to change from miles to KM then the odometer will be reset to 0000 there is no calculation made between existing miles into KM unfortunately so if you want to carry them over you will need to write them down, convert to the new unit of measurement yourself and input them again.Can't complain about this at all for the money. I am hoping the batteries last a while.

I received a refund for the faulty one. The other works well and does exactly what it supposed to do. Perhaps I was just unlucky with one of them.

I installed it on my kids bike with 16 inch wheels.Happy with quality. Measures correctly- compared with my sigma 1606sts.Green backlight is also good. Install kit makes sense.

It work fine for about an week then the sence stop picking up the movemet of the magnetDont bye

Looks good, but a bit hard to set up, from kilometres to miles, apart from that it's OK

Bought this to track my miles and speed. There are so many functions you can use. Great size dial easy to readDoes what I need it forGreat item

Has all the usual features. Easy to install. Also has a simple clip-unclip on the mounting so you can pop it in your pocket when you're out. Big display and I checked it with a GPS as the speed is pretty accurate.

Easy to install and set up. My son loves it on his bike. Seems accurate and a plus was it came with batteries.