Polar RCX3 Bike Heart Heart Monitor Unique training benefit feature provides instant feedback after your workout Includes CS speed sensor W.I.N.D. for cycling speed and distance Lets you share your training with friends and track your progress with polarpersonaltrainer.com, our free online training diary Compatible with s3+ stride sensor for running speed and distance and the G5 GPS sensor Slim silicone wristband wipes clean and is designed specifically for female wrists