Specifications:Creative LED luminous finger Yo-Yo looks cool.This finger spinning ball is great for fidgety hands and ADHD sufferers, which helps relieve stress.A switch on ball to turn on/off the LED light.Perfect size, this Yo-Yo style hand spinner is suitable for both adults and kids.A perfect gift for children, friend or family at birthday, Christmas, etc.Advantages:1. Great for anti-depression, anxiety, focusing, ADHD, autism, quitting bad habits, staying awake.2. Easy to carry, small, simple and fun, also effective for focus and deep thought.3. Perfect finger toy to keep your hands busy or to just play with. It feels nice in the hands and it is silent so you won't be bothering anybody.Type: Luminous Yo-Yo Hand SpinnerShape: Double Balls Linked by One StringMaterial: Plastic, LEDPower Supply: Button Battery (Included)Features: LED Light Finger Yo-Yo, Decompression Hand Spinner Toy, Glow In The DarkBall Size: 3cm x 2.5cm/1.18" x 0.98" (Approx.)Length: 20cm/7.87" (Approx.)Notes:If the LED light not work, the battery might run out of energy during the long-distance transportation, you may use a thin blade pry glass, or replace a new battery.Thanks for your understanding.Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.