Cleaning Cycle It's suggested to place the device in a ventilated environment 6 hours bee first-time use to get a cleaning cycle sensors. During the procedure, please turn off the device. HCHO(maldehyde) Calibration It is suggested to calibrate the detector manually after three months of use as follows. Turn on the detector and wait 10 minutes. Use a pin to push the hidden button at the back of the device until HCHO(maldehyde) icon flashes on the screen. Place the detector outdoors ventilation purposes 10 minutes. The calibration is done when the HCHO icon stops flashing.
