After turning on the Bluetooth of the phone and watch, scan the QR code on the watch in the LinkTo Sports App to quickly connect the watch with the phone. If the watch and the mobile phone cannot automatically establish a connection after you have successfully completed the first matching connection, please follow the following steps to exclude: - Please make sure that the Bluetooth on the phone is turned on, and keep the wristband and the phone within 0.5 meters. After pairing Bluetooth successfully, the Bluetooth communication range is less than 10 meters. -Please check whether the battery of the wristband is low. -Please restart the Bluetooth connection.