Polar 91037386 Speed Sensor W.I.N.D. Heart Rate Monitor with Universal Bike Mount Includes aerodynamic and light cycling speed sensor W.I.N.D. and a universal bike mount to attach to your bike's handlebar Speed sensor W.I.N.D. measures the current, average and maximum speed of your ride Interference free speed data lets you evaluate and analyze your individual performance more accurately Universal bike mount is ideal for attaching your Polar wrist heart rate monitor to your bike handlebars Lets you easily view your training data while riding