|It's their own personal laugh track, guaranteeing that everything they write will be wildly amusing. On the outside, it's a normal-looking pen. But when they push the button on the side, it emits a 20-second belly laugh sure to elicit chuckles from anyone in the vicinity. The refillable pen features a simple matte silver finish and measures 5 1/2" long. Requires three LR44 cell batteries (included).