- Magically light up the dark with your fingers!- Powerful ultra-bright green 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                                                                                                                                Dimensions: 1.57 in x 0.98 in x 0.87 in<br />Weight: 0.6 oz