Turns Suunto training instrument into a wireless bike computer. Current and average speed, plus and distance alarm are displayed on the Suunto T3, T4 and/or T6. Sensor attached to the fork with cable ties. Adapts easily to the full range of bike forks, wheels, hubs and axis. Range up to 10m/ 30 ft. User replaceable battery CR2032. Comes with spoke magnet for regular and flat spokes, and bike adapter.