Small personal care appliances such as electric toothbrushes and electric razors need to be washed frequently to keep clean, but if water enters the casing, and damages the batteries, it will cause product failure. However, if the casing is completely sealed, the accumulated hydrogen and heat emitted by the batteries will not be released, which can cause safety concerns. IPRO adhesive vents installed at the pressure relief hole of the casing of electric toothbrushes and electric razors can ensure waterproof in high-humidity environment, and dissipate heat and gas in time, thus providing better product safety for consumers.