Using the Cateye Quick RS100W is easy. First, mount it on your bike using the integrated out - front bracket. Then, turn it on and it will start measuring your speed and distance right away. When you're done with your ride, you can simply turn it off. As for maintenance, keep it dry as it's weather - proof but excessive moisture might still damage it. Clean it with a soft, dry cloth. Also, make sure to change the battery when the power gets low. Avoid dropping it or subjecting it to strong impacts to keep it working properly.