58dB Silent Tech! RONGBEI Vacuum Patents Noise Reduction

RONGBEI VC-900 Vacuum certified (CNAS-SOUND-20190418) with 3-stage noise control:

1. Vortex airflow design
2. Floating motor mount (↓30dB vibration)
3. Microporous foam (92% absorption)
   Noise Comparison (1m distance):
   | Brand | Max Mode | Sleep Mode |
   |—|—|—|
   | RONGBEI | 58dB | 42dB |
   | Competitor A | 78dB | 65dB |
   | Competitor B | 82dB | 68dB |
   Patent ZL201920123456X granted, ideal for night/baby car use.