Model V1900. Releases soothing menthol vapors. Waterless, no spills or refilling. 3 Scent levels. Silent operation, perfect for bedside use. Scent releases up to 8 hours/pad. Soft, soothing nightlight. The Vicks Waterless Vaporizer works by heat activating the soothing menthol vapors in the scent pad and releasing them into the air. No water necessary, perfect for humid areas or when dry air is not a problem. Scent pad with soothing menthol vapors will last up to 8 hours. Soft nightlight helps locate waterless vaporizer in a dark room. Three settings to control the amount of soothing vapors released into the air. Advanced heater technology offers precise temperature settings. Made in China.