Adept mountain biking, night time and especially by some all time, I opted for this counter which supposedly met all my expectations (reliable, no loss of signal, especially bright and waterproof). After being disappointed with a wireless meter of another brand, I still bought this meter to compare, and I must say that there is no picture: After over a month of use, sigma is very good, reliable and above all, once mounted (moments), no signal loss and a very good readability (I mounted the gallows but can also attach to the handlebars). The temperature display is a little more well nice (I confirm that it also displays zero temperatures after a night out at -6 °) and is reliable. (Screen "train" a little by t ° very cold but it is quite normal for an LCD). Concerning security, despite the elastic provided for editing, I still add 2 cable ties on the bracket and the sensor mounting bracket (small slots are provided for this purpose). Maybe these elastic suffice but it is just to reassure myself about a possible loss of one of them. In summary, a good product, reliable and robust, using days and night (practical light function) and in all weathers.