The Wahoo Trackr Speed sensor is the sleek, magnet-less solution for capturing cycling speed dataEasily mounts to front wheel hubs, and the Bluetooth Smart and ANT+ dual band technology allows connecting to and display of data on both smartphones and bike computersTwo LED lights show the sensor`s device connection (blue) and speed detection (red)Operates on a coin cell battery for up to 200 hours of useANT+/BLESpeed SensorBlackUPC/EAN/GTIN: 850048106277