HENGBANG Magic Light up Finger Magic Trick, LED Finger Lamp, Blue Thumbs Light, Magic Light up Finger Magic Trick, Fake Finger, Prank Toy Tool Magically light up the dark with your fingers! Powerful ultra-bright blue LED emitter Automatically turns on when inserted onto fingertip, turns off when removed Powered by 2 x 3V CR1620 batteries (included) Perfect novelty gift for yourself and those around you