Polar 91026655 Wireless Black bicycle computer

CS SPEED SENSOR W.I.N.D. AND TWIST LOCK BIKE MOUNT The CS speed sensor W.I.N.D. and Twist Lock Bike Mount set includes an aerodynamic and light cycling speed sensor for wireless speed and distance measurement and a bike mount to attach to your bike’s stem or handlebar, giving you an optimal view of your cycling data.

Measures your current, average and maximum speeds
Interference-free data lets you evaluate and analyze your individual performance more accurately
Easy to install to stem or handlebar
Easily attach and detach your cycling computer with the twist locking mechanism