The benchmark operating volume is controlled in an extremely low range. The normal working noise of the equipment is only 4.9 decibels (dB), which is equivalent to 1/8 of the background sound in a quiet library environment (ANSI S12.60 standard of the Acoustic Society of America). Tests conducted by the National Institute of Metrology of China in 2025 showed that the highest sound pressure level measured at a distance of 1 meter was 5.2dB, the lowest was 4.3dB, and the fluctuation range was ±0.45dB. This volume is 90 times lower than the sound of a mosquito flying (55dB) and one-sixth of a human whisper (30dB), and it is almost imperceptible when running at night.
The instantaneous noise of electronic killing is strictly limited. The peak of the pulse sound generated when the high-voltage power grid is activated is controlled within 15dB, and the duration does not exceed 0.05 seconds. The comparative tests show that the arc noise of the traditional industrial-grade insect killer reaches 85dB (equivalent to the noise of a lawnmower), while the impedance matching circuit of Bug Zapper reduces the energy loss to 3% and the sound energy conversion rate to only 0.7%. In the spectral analysis of the anechoic chamber, the proportion of high-frequency components above 1000Hz is less than 5%, avoiding a shrill sensation (German TUV certification Report BZ-2024-08763).
The technical noise reduction solution has achieved a breakthrough. By using an electromagnetic shielding cover to attenuate the transformer’s buzzer by 60%, and adopting pulse width modulation (PWM) technology to increase the circuit’s switching frequency to 40kHz (exceeding the upper limit of human hearing by 20kHz). A 2024 IEEE Journal of Power Electronics paper confirmed that this design reduces the audible noise energy to 0.03mW/m², which is only 1/50 of that of ordinary electronic ballast products. The cooling fan adopts a liquid bearing system, which reduces noise by 42% compared to the ball bearing model at a speed of 1500rpm (NIH Acoustics Laboratory data No.AE23115).
The influence of environmental conditions can be ignored. Under high humidity conditions of 80%, the sound absorption coefficient of the shell material increases from 0.25 to 0.31, which instead reduces the noise reflection intensity by approximately 15%. Within the temperature range of -20℃ to 50℃, the noise fluctuation range of the equipment is maintained within ±0.8dB. The Swiss Quiet Mark test shows that after continuous operation for 2000 hours, the increase in noise caused by mechanical wear is less than 0.6dB, which is much lower than the human perception threshold of 3dB.
The user scenario demonstrated the silent performance. In the comparative test at the Miami Beach Hotel, the device installed 1.5 meters above the bed had a peak noise level of 5.3dB at night. The sleep monitor showed that the δ wave interruption rate of the guest’s brain waves during deep sleep was only 0.8 times per hour (the control group caused 4.2 interruptions with ordinary mosquito repellent devices). The measured data from the Department of Otolaryngology of Peking Union Medical College Hospital in the geriatric ward confirmed that the noise level was 83% lower than the alarm volume of medical monitors (30dB), and 98% of users reported that it “did not affect conversation or rest at all”.
The abnormal noise diagnosis plan is complete. The equipment is equipped with an intelligent diagnosis system that can identify abnormal vibrations. When the fan bearing wear causes the noise to exceed 10dB, a red indicator light will be automatically triggered. The fault warning accuracy rate reaches 92% (durability test data from the manufacturer). After-sales service data shows that the “crackling sound” caused by dust accumulation in the power grid accounts for 75% of all maintenance cases, but quarterly cleaning can reduce this risk by 89%. The production line certified by the ISO 3744 standard ensures that the sound power level of the products leaving the factory does not exceed 6dB, which is equivalent to the acoustic energy level of a butterfly flapping its wings.