The Air Freshener PCB operates through a rotary switch (modes 1-5) and an IR remote (7 buttons) to control a motor-driven spray system. Modes set varying intervals (instant, 15, 30, 45 mins, PIR trigger) for a 2-second motor run. The Red LED blinks to indicate the selected mode, and the Green LED lights up during motor operation. The system uses a PIR sensor for motion detection and a voltage divider circuit for mode selection through the rotary switch.