Instructions: 1. The internal part of the canister/filter is a complete set of fan system， namely battery bin， please press the button "OPEN" at the rear of the filter， anticlockwise rotate the cap to close， and fill in the battery then close it. 2. According to the individual aiming habit， you can install the filter at left or right side of the mask. 3. Press the delay switch behind the filter， the fan will start to work for the circulation system in order to eliminate perspiration rapidly. After startup the circuit for 8 minutes， it will automatically shut off in case of the damage if the users forget to turn off it after finish working. 4. Do not need to remove battery， and the standby working current is in a resting state(less than 5VA)