Product Details Model: 55616 Product dimensions: 6 x 7 x 2.25 inches Package dimensions: 8.8 x 7.3 x 2.2 inches 6 natural sounds heartbeat, white noise, ocean 15, 30 or 60 minute auto-off timer Portable perfect for new mother or traveler Battery or adaptor operated adaptor included and uses 4 AA The Homedics mybaby soundspa portable creates a comforting environment, with six nature sounds to choose from heartbeat, white noise, ocean, summer night, thunderstorm and brook. The soundspa portable is perfect for the new mother or traveler, working off of four AA batteries (not included) or the included adaptor. The 15, 30, or 60 minute auto-off timer makes the soundspa portable not just easy to take with you, but easy to use.usa