When adjust the gear, it makes a beep sound. Gear 1 makes a beeps.Gear 2 make 2 beeps. Gear 3 make 3 beeps. Gear 4 make 4 beeps.OFF: Power off (solar energy or Type-C can continue to charge)1: The ultrasonic frequency is 20-25KHz, which can drive away dogs, cats,foxes, deer and other wild animals. 2: The ultrasonic frequency is 13-60KHz, which can drive away rats, dogs,cats, raccoons, badgers, skunks, wild pigs and other wild animals.3: LED flash lamp+voice alarm can drive hunting dogs, birds, wild pigsand other wild animals. 4: Cycle in gear 1-3 to drive away all wild animals.Sensor Sensitivity/Sonic Volume: Adjust the infrared sensing sensitivity. Turn the knob anticlockwise toshorten the sensing distance. Turn the knob clockwise to increase thesensing distance. Adjust the voice alarm, turn the knob anticlockwise to turn down thealarm sound . Turn the knob clockwise to turn up the alarm sound.