About the size of a matchbox, this is the sound machine that helps muffle the ringing and buzzing of tinnitus. The device’s 24 doctor-developed tracks include nature sounds such as Hawaiian waves, thunderstorms, and woodland birds, as well as gray-, pink-, and white-noise frequencies. The digital sounds play continuously or can be set to a 30-, 60-, or 90-minute timer. It also has a built-in volume control and attaches to clothing with an integrated pocket clip. Includes earbuds, travel case, USB charging cord, and SD card preloaded with tracks. A full charge provides 15 hours of power. 1 3/4" L x 1 1/2" W x 3/4" D.