Squiggle Wiggle Writer by Hart Toys, Colors may vary
The Squiggle Wiggle Writer is a battery operated vibrating pen that allows the creative writer to turn straight lines into a series of loops, circles, or curves, depending on how closely it is held to the writing surface. It gives the user tactile stimulation and encourages appropriate grasp. Includes four different color refills. Uses a single AA battery, not included. Colors may vary.