Review on Bike Speedometer with LED Bike Light and USB Rechargeable Bicycle Computer: An All-in-One Cycling Accessory with Loud Bike Bell and Waterproof Odometer Bicycle Light Set for Mountain and Road Bikes by Dan Germain

This bike is as easy to assemble as it is. The tach works fine. It took me a little time to set it up. I'm a cycling noob but after following the instructions and doing the initial reset this thing is awesome! It is very bright and the rear light is very aesthetic. Helpful Tip: Plug in the horn/light buttons. If the horn does not work when you press the button, you need to reset it with a reset contact. The instructions indicate that an initial reset is required. After the beep, the light is ready to use!