Overview Compatible with dozens of leading fitness apps, the Polar Speed/Cadence Sensor Combo Set is the perfect companion to any ride. A small, lightweight design occupies a tiny footprint and can be securely attached to the handlebars or frame of any bicycle. Either device works with Bluetooth® Smart technology to record data accurately and with very little power consumption. Any data recorded can then be imported into a raft of third party applications and devices (see list below), alongside Polar's own V800 Heart Rate Monitor and Polar Flow web service, for further analysis. Speed Sensor Data pertaining to speed, distance and time can be recorded and then extrapolated to identify progress or irregularities in training. Cadence Sensor Cadence and pedalling rate data is recorded accurately and can be used alongside that received from the distance/speed sensor to identify optimum pedalling rates in terms of efficiency and energy expenditure etc.