• 20 non-looping sleep sounds: includes white, brown, pink, blue noise, fan, stream, rain, ocean, birds, and campfire. Ideal for babies, children, and adults. • Precise volume and timer settings: with 32 volume levels and timer options from 1 to 5 hours or continuous play, you can customize the perfect sleep environment. • Compact design and adaptive sound technologies: with dimensions of 6.3 x 4 x 2.4 inches, it is portable and suitable for home, office, or travel. Adaptive sound technologies ensure a restful sleep. • Memory and safety function: automatically restores previously set volume, sound, and time. Works with AC (not included) or USB. Approved by FCC, CE, and RoHS for added safety. • Product dimensions: 6.7 cm wide, 7.2 cm high, and 6.7 cm long. Weight: 0.001 kg.