What the well-prepared Time Lord has on hand for any situation.
LEFT TO RIGHT: Fourth Doctor, Ninth/Tenth Doctor, Master's Laser, Eleventh, and Twelfth. The Twelfth Doctor's only has one button (Eleventh's has two, one for extending the sonic and one for sounds; plus a button in the rear for sounds in extended mode); for extension only. But, the sounds come from touching the black part...no button required! Plus, sounds work in extended or closed mode. Rear pulls out for a 'power core'.
Just because I can't make them anymore, doesn't mean I can't buy them!