1. Setting key:

        (1) In the parameter setting state, press this key to write the setting parameter and enter the next parameter setting;

        (2) When "black box" records the inspection status, press this key to end the inspection record state and enter the normal working state;

        (3) Press this key to enter the normal working state when the function simulates the detection state.

        2. Fan / shift key:

        (1) During normal operation, press this key to switch on and off the fan manually;

        (2) In parameter setting status, press this key to change the setting flashing bit

        (3) When "black box" records the check status, pressing this key is invalid.