The 8th Doctor's multi-purpose tool is a Gallifreyan device and is equipped with numerous settings. The sonic screwdriver is easily controlled with the press of his thumb. The Doctor has had many sonic screwdrivers of different designs throughout his life and now you can finally own the 8th Doctor's Sonic Screwdriver. The 8th Doctor's sonic screwdriver comes with realistic sound effects with a push of a button. Requires 3x "L1154" batteries which come included. Measures abut 8 1/2-inches long. Ages 5 and up.