Our Sensory Fibre Optic kits consist of an LED power source featuring multiple operation modes including static or colour change with a choice of three speeds, so you can change the effect to provide exciting visual stimulation, or create a profound calming effect, ideal for adults or children with anxiety or sleep disorders. Fibre optic kit includes both the Tails and the fibre optic engine,this is a plug and play set. The fibre optic strands are completely safe to the touch due to no electricity travelling down the fibres themselves, the strands only carry light. The polymer fibres in a clear sleeve, which is cracked so as to leak out light all down the length, rather than just the tip of the fibre optic, giving a wonderful magical sparkly effect. The PVC in these harnesses is phthalate free and the harnesses themselves have CPSIA and EN71 toy certifications so you can be sure you are purchasing a safe, high quality, UK made product.