An interchangeable tip (10) comprising: (a) a stylet (16); (b) a blade module (18) including: (i) an enclosure (30) that electrically connects, signally connects, or both the interchangeable tip (10) to a power source, a signal source, or both; and (ii) blade circuitry (40) having: (1) one or more switches (120) for controlling operation one or more functions of the interchangeable tip.