This vaporizer works by heat activating the soothing menthol vapors in the scent pad and releasing them into the air. No water is necessary, perfect for humid areas or when dry air is not a problem waterless, no spills or refilling 3 settings to control the amount of soothing ...This vaporizer works by heat activating the soothing menthol vapors in the scent pad and releasing them into the air. No water is necessary, perfect for humid areas or when dry air is not a problem waterless, no spills or refilling 3 settings to control the amount of soothing vapors released into the air silent operation soft, soothing & nbsp nightlight advanced heater technology scent releases up to 8 hours per pad uses vicks vapopads vbr-5, vsp-19 contains 5 non-medicated vapopads made in china.