I bought this only for the odometer function. I just wanted to know how far I was riding each day . I usually ride only two different routes that cannot be verified by driving my car over the same route. ( dedicated bike trails ). It is really not a bad unit for the price. I don't need something that will last for years. Once I know the distance of the routes I could just un-install it if I wanted to.. Ordered on a Wedesday A.M. and it arrived on Thurdsay P.M..It took about 10 minutes to install and off I went. Tested on a route @ Lake Perris Ca. and I was riding 12 miles( assumed it was 10 ) . So if you are looking to buy one, just do it. It is very inexpensive and will probably last a long time if you are careful with it ..