DUAL BAND TECHNOLOGY - Integrated with ANT+ and Bluetooth Smart capabilities, Wahoo’s TRACKR Speed sensors connect to smartphones, tablets, and bike computers by Wahoo, Garmin, and others. SLEEK AND EASY TO INSTALL (NO MAGNETS) - Speed sensor attaches to a bike's wheel hub. Mounts included. VISIBLE CONNECTION – Two LED lights show the sensor's device connection (blue) and motion detection (red). UNIVERSAL FIT – Sensors will fit with most bikes and frame sizes. WAHOO HEADWIND COMPATBILE - Control the speed of your KICKR HEADWIND by pairing an ANT+ speed sensor, heart rate monitor, or smart bike trainer directly to the fan.Wahoo ECOSYSTEM - TRACKR Speed & Cadence Sensors are compatible with Wahoo ELEMNT GPS Bike Computers and Wahoo KICKR indoor training accessories including the KICKR DESK, KICKR HEADWIND Smart Fan, and KICKR TRAINER FLOORMAT. Build the ideal setup for your indoor cycling needs.