SereneLife Ultrasonic Humidifier, Warm/Cool Mist Moisture Built-in Night Light (PSLHUM80) QUIET & EASY: The SereneLife humidifier uses ultrasonic technology to emit over 430 square feet of warm or cool mist for full coverage for any room in your home. BREATHE COMFORTABLY: The cool mist humidifier effectively increases humidity levels and assists in eliminating uncomfortable dry air. EASY TO USE: The mist humidifier features an easy to refill water tank that works with regular 'kitchen sink' tap water. CUSTOMIZE YOUR AIR: This ultrasonic humidifier allows you to choose between warm and cool mist vapor to create a more comfortable and breathable living space. Adjustable vapor water flow puts you in charge. MODERN DESIGN: This sleek air humidifier uses an energy efficient design making it perfect for any room in your home or office, including yoga and massage studios.