1、 Mode setting: 1 sensor can only select one mode (speed or cadence) at a time. So you need 2 sensors to test speed and cadence. (1 for speed, 1 for cadence)2、 Battery usage: Remove the insulating sheet of the pre-installed battery before use; reinstall the battery to switch between speed and cadence modes.3、 Bluetooth device: When using the Bluetooth protocol, 1 sensor can only connect to 1 APP or device at the same time; when using the ANT+ protocol, it can connect to multiple devices at the same time.4、 Connection settings: When using the smartphone APP, you need to search for the sensor in the APP, and the search through the Bluetooth settings of the mobile phone system is invalid.5、 Sleep state: The sensor will automatically enter the sleep state for 1 minute after the sensor is stationary to save power, and the sensor will only start sending broadcasts after it wakes up correctly. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.