The Sound Activated Crab is a sound activated toy designed for use by children three years old and older with speech, severe physical, or cognitive disabilities. Clapping hands, snapping fingers, talking, or making a noise causes this toy to vibrate and wiggle. The user can place the toy on a smooth surface, make a sound, and watch the crab move around as if crawling. After a few seconds the toy turns off and waits for a new sound to start vibrating and moving again. The toy is also equipped with an on/off switch. POWER: Uses 2 double-A batteries. DIMENSIONS (HxWxD): 7 x 9.5 x 4 inches.