The Wow Stuff Sonic Screwdriver is a screen-accurate die-cast replica of the 11th Doctor version. The Wow Stuff sonic has light and sound effects; the end opens and a green (not blue) light flashes. What's more it doubles as a DIY tool; it includes interchangeable heads (S, M, L) with reversible Philips and flathead bits. It takes 2xAA batteries. The makers claim this sonic is designed to be good enough to actually use in the show. Due August 2010