Offered exclusively by Hammacher Schlemmer, this machine allows you to design your own tranquil acoustic environment that promotes concentration and relaxation in a busy home, noisy office, or a hotel room in a bustling city. Unlike other machines with computer-generated sound, ours uses the latest digital technology to create aural atmospheres from sound recorded at the source. Six included sounds (rain, surf, summer night, stream, wind, and white noise) mask distracting background noise; additional sound cards are available. With timer, digital alarm, and headphone jack. Runs on included AC adapter or four AA batteries. Blue. 6 3/4 H x 6 1/4 W x 3 D. (1 1/2 lbs.).