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How to operate the laser of Dr. Zhou's light wave rehabilitation physiotherapy instrument?
Operation of laser in Dr. Zhou's light wave rehabilitation physiotherapy instrument

Insert one end of the laser line into the laser jack on the left side of the instrument and insert the laser head into the nostril for correct placement. Press the "Laser" function key, the laser (low-medium-high-off) will be output circularly, and the corresponding display screen (low-medium-high) will display a prompt.