Do Fenix flashlights that use APF technology require a mechanical tail switch, electronic side switch, or rotary switch?
No. APF is just a technology and can work with either mechanical or electronic switches or a combination. For the TK11 TAC, the tail switch is a mechanical-electronic combination. The rotating switch is mechanical; the forward switch is electronic. A perfect simulation of a regular forward switch, brings more advantages: fully silent operation, ambi-adjustable brightness, and multi-functional performance.