With the further development of intelligent technology, even electric bicycles are gradually equipped with intelligent functions such as voice interaction. However, outdoor environment is usually harsh and full of sudden changes, posing great challenges for extremely sensitive acoustic devices, which requires high level of protection against water and dust, especially when exposed to outdoor environments for long-term. IPRO acoustic vents installed at the sound permeable area can prevent rain and other liquids from entering the cavity, reduce sound loss, block external pollutants, and restore original sound quality.