The Polar Power unit can be added on to the S-710 to combine the benefits of training with heart rate and watts. Also measures your left and right pedaling and overall efficiency. CC-PR $349.95
package includes---power output sensor,chain speed sensor,bike mount,
cadence magnet,2 spoke magnets,battery,cable ties,
rubber pads,user's manual
total weight-------560grams [by tech]
display------------n/a
bike mount---------included
features-----------compatible with POLAR S710 heart rate monitor
