The Sonic Screwdriver is a versatile tool fused by the doctor for opening up hatches, panels and controls. This electronic version of the Tenth doctor’s (David Tennant) Sonic Screwdriver is complete with lights & sounds. Comes with two different pen nibs: Invisible ink & black pen ink. The UV light will reveal anything written in the invisible ink. Press the button to hear the Sonic Screwdriver activate. Slide one of the buttons to extend the Sonic Screwdriver .