A crazy colourful colour changing led light up pen you can even write with itr r this led pen is definately an attention grabber why have a light up pen you can write in the dark if you ever need to or just show off by having a light up disco pen coolr replaceable batteries1 000 hour led bulbbatteries includedcolour changing flashing fading led lighttwist amp write pen nibclick on click off led lightsblack ink