Bluetooth pairing

In a shutdown state, long press the multifunction key for 3 seconds. The headphone blue light is always on for 3 seconds and the red/ blue lights flash alternately. At this time, the headphones enter the automatic Bluetooth pairing mode and the headphone voice prompts "beep". Turn on smart devices such as mobile phones, find "Runner Air" from the Bluetooth list, and click on the connection; After confirming the connection, the headphone prompts "beep".