Sealed injection molding packaging structure, preventing moisture from seeping through the floor from damaging the sensing element Standardized module specifications, allowing multiple models of vacuum cleaners in the same series to be directly interchangeable. Non-wear photoelectric sensing design, capable of returning millions of times without sensitivity degradation Flat transparent cover plate. Surface stains can be removed by wiping with a cloth. Wide-angle signal coverage, the sides and front of the base can all be recognized by the machine.