This sound relaxation machine can help create perfect sleep environment for you and your baby. You can fall asleep quickly with any one of its 9 relaxation sounds, which can also mask undesired distractions to improve your concentration while reading, working or studying. Features: 1. Built-in 9 soothing sound, timer function for 9 soothing sound, powered by AC adapter. 2. ABS material is environmental, safe, non-toxic, odorless and harmless. 3. White noise can enhance sleep quality, create relaxed atmosphere, improve concentration and mask inside or outside undesirable noise for you and your baby at home, office, dorm, kids room, nursery etc. 4. Can be played continuously with auto-off timer of 15 min, 30 min and 60 min. 5. Power is supplied by USB or battery(not included), which is convenient. 6. Portable size and light weight are ideal for travel use. Specification: Item Type: Sound Therapy Power: 1.5W Voltage: 5VDC 300mA Material: ABS Color: White Power: 4-AA batteries(NOT include) Timer: 30min, 60min 90min Product Weight: 260g Package Size: 16.5 x 14 x 6.3cm / 6.5 x 5.5 x 2.5inch Function: Sleeping Aid Package List: 1 x Sleep Sound Machine 1 x USB Cable 1 x English Manual