Each sensor has two modes: speed and cadence,which can be switched by installing a battery; Two sensors support simultaneous recording of speed and cadence. Reinstall the battery to switch the mode. Cadence Mode 1.Reinstall the battery until the RED Light flashes to indicate Cadence Mode. 2.Rotate the crank and search for the sensor using ANT+/Bluetooth device. Speed Mode 1.Reinstall the battery until the GREEN Light flashes indicate Speed Mode. 2.Spin the wheel and search for the sensor using ANT+/Bluetooth device. Remember to remove battery insulation sheet before installation. CONNECTION WITH PHONE APP 1 Turn on the bluetooh on your phone. Tips:Don't searching sensors through the phone system's Bluetooth settings. 2 Click the cycling app to connect sensors. Tips:Don't forgets to remove battery insulation sheet. 3.Check the App displays the data normally. Tips:Please tell us about any issue. We will do our best to serve you. ABOUT GEOID In 1873, J.F Listing created the word Geoid to define the concept of Mathematical Representation of the Earth in geodesy. It represents the endless exploration of the earth and the universe, and is the crystallization of human outside exploration. Exploration never ends, Geoidsports is a brand founded by a group of geeks who advocate continuous exploration. Geoidsports is committed to applying cutting-edge technology to products to help athletes and cyclists obtain more professional cycling equipment and build the ability of exploration. At the same time, Geoidsports helps riders better to understand the movement state and physical changes during cycling, and inspire the courage of internal exploration and self-transcendence. The advent of Geoidsports products has opened a new milepost of exploration for cyclists. Integrates the power of science and technology, the passion of cycling and the courage of exploration, making every cycling experience beyond imagination. All for riders, all for cycling. Join us to enjoy the cycling and know all about Geoidsports.