Review on Zwq Waterproof Speedometer Multi Function Display Speed Accessories by David Perry

Easy enough to install and seems to work so I threw the box away and my wife started using it about a week later. I have set up many speedometers so I know how to set everything up. The odometer and speedometer began to work intermittently. Adjusted the place for the magnet and even changed the transmitter battery, although the test showed good results. Once it worked for sure, and then it was impossible to trust the mileage. Now the buttons are completely out of order and the clock does nothing. Replaced main battery, no change. I wouldn't buy this again.