<p class="label"> 1. Download related apps to mobile phones according to different inspection requirements </p> <p class="label"> 2. Open the app you want to test </p> <p class="label"> 3.Turn on the device switch, Bluetooth automatically matches with the phone </p> <p class="label"> 4. Pairing is successful; then operate the device according to the instructions of the mobile phone </p> <p class="label"> 5. Pairing is unsuccessful; it means that the device is not compatible with the phone </p> <p class="label"> 6. The device will automatically shut down after 20 seconds of inactivity </p>