This switch adapted Letter Bug is an engaging way to teach colors and phonics through lights, sounds, and music. The Letter Bug has been adapted to accept a standard 3/8" (3.5mm) switch, sold separately. Press and release your switch to see lights and hear songs about the letters of the alphabet and colors. The Letter Bug can also be operated without a switch by directly touching the toy's buttons or rolling the toy. May not be suitable for individuals with seizure disorders. Measures approximately 4"x 5" x 6". Requires 3 AAA batteries, included.