PerfectAire PAU1 Personal/Travel Cool Mist Ultrasonic Humidifier, Energy Star Rated, 360-Degree Adjustable Output Direction, 12-24 Ounces, Grey Travel-size personal ultrasonic humidifier Micro Mist technology Fits most standard 12-24 ounce water bottles 2-6 hour run time 0.95 gallon daily output (5 oz/hour)