Cupsland education
Thin walls, hard furniture, nighttime background levels, room placement, and product contact can change what another person hears. A sound measured close to the device cannot be compared fairly with one measured across a room.
Record the mode and intensity, distance from the product, room type, supporting surface, background sound, and whether the product is running freely or in contact. Use the same conditions when comparing models.
A maximum figure describes a stated upper result under some conditions; it does not automatically mean silent, discreet, or suitable for thin apartment walls. Ask for the test distance, mode, environment, and method.
Consider the quietest and loudest modes, late-night background noise, roommates, shared walls, storage, charging, and where the product will be placed. Do not use the product incorrectly to suppress sound.
Use the buying checklist to compare noise information alongside cleaning, storage, controls, and privacy.
FAQ
They have no powered motor, but overall sound still depends on use and surroundings.
Possibly. Compare a test that states the mode, intensity, distance, supporting surface, room, and background sound, then consider shared walls and the actual time of use. A single dB figure cannot guarantee that roommates will not hear a product.