Homedics Cool Mist Ultrasonic Humidifier for Baby with Built-In Soundspa HUM-PED1 Integrated Sounspa for added relaxation and comfort includes four soothing sounds: white noise, summer night, heartbeat and cradle song and adjustable volume control Anti-microbial technology helps to prevent the growth of molds and mildews on the surface of the water tank Easy to remove and fill 1 gallon tank and provides up to 24 hours run time per filling Adjustable mist control with built in ON/OFF night light Demineralization cartridge included to eliminate white dust caused by hard water