This machine allows you to design your own tranquil acoustic environment. Offered exclusively by Hammacher Schlemmer, the authentic sounds machine 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) play for 30, 60, or 90-minute intervals or continuously; additional sound cards are available below. With digital alarm and headphone jack. Runs on included AC adapter or four AA batteries. 6 3/4" H x 6 1/4" W x 2" D. (1 1/2 lbs.)