The polar v650 with hear rate monitor is a cycling gps unit with great features to help you train first of all the unit has a large touch screen which makes for easy reading and use the v650 has enough memory for up to four different bikes you can set up each bike with the sensors the unit should look for when riding to work with this the computer has four sport profiles road cycling mountain biking indoor cycling and other all of theses profiles can be altered and customised to suit you