A product to AVOID!

I ordered this counter at the beginning of the summer of 2013, I received it, it was not working.
AMAZON agreed to return and I asked for a replacement which has been done in the shortest possible time.

After a summer of 2013 where counter served me well, here in December of the same year, I want to remake a small bike ride, and the meter turns on but does not work, I'm pedaling, make KM display is blank.

The sensor is applied properly, I reset to zero, I applied all the advice I found on the internet ... nothing works !!
So since I can not return .... I just do not its PUB!

It is a product to avoid for me!