This fun Doctor Who DIY set lets you create your very own sonic screwdriver and act out your own dreams of being the 13th...or 14th Doctor! It features over 80 possible combinations so you ll have plenty of ways to customize it to your liking. You can even choose your own colored light and sound effects! Requires 3 x L1154 batteries (included). Sonic screwdriver measures 1.6 H x 8.7 W x 11.4 D.