This circular vibrating cushion is ideal for use as a bolster seat, circle time or any sitting situation. When sat on or squeezed this vinyl-covered sensory cushion gives a subtle vibrating sensation. The vibration ceases when not in use.. no on/off switch. The Senseez sensory cushions make ideal special needs cushions, especially for children with autism, ADHD or sensory processing disorder. The vibrating cushions can calm children who need more sensory feedback or help train hypersensitive children to tolerate more sensations. Measures 24cm in diameter x 7.5cmH.