May I have further information about hall sensor?

Hall sensor proves invulnerable to dust accumulation. BenQ Dust GuardTM's hall sensor is significantly more dust-resistant than traditional sensors, with uncompromised functionality even when levels of dust deposits reach 7X* higher. The hall sensor utilizes magnetic signals for timing, which is invulnerable to dust accumulation. Even in severe environments with possible dust accumulation, the hall sensor signal can still effectively distinguish colors for precise alignment and uninterrupted projection.
After experimenting in the same environment, hall sensor maintains normal functionality even after having 40g of sand inside, whereas traditional sensor loses its detection capacity after having 6g of sand inside.
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