Item Type: Finger Light Up Thumb Material: PVC Product Size: Approx. 4.5cm/1.8in Battery (shipped with built in battery): 1 x CR1220 Button Battery, 3V, 40mAh Applicable Age: Above Aged 14 Weight: Approx. 85g/3.0oz 1Battery Powered: Powered by button batteries, they are suitable for most thumbs and fingers and are great light up props for Halloween, concerts, hiking and nightclubs 2Simple Operation: Automatically turns on when inserted into the fingertip, turns off when removed and secretly turns on the light under pressure from the thumb tip 3Performance Prop: You can pass the light from one hand to the other, making it disappear and reappear for various effect shows 4Suitable User: These finger lights are the size of an adult thumb and are only suitable for people over 14 years old 5PVC Material: Light up finger tips are made of PVC, which is wearable and durable, and can be used with confidence5 Pairs x FingerLightUpThumbShipped with built in battery