“ For example, if you select the "Better Battery Life", there is a setting
that will slightly dim the display preserving a bit more battery life.
Smartphone displays are bigger and brighter than ever, but they
are also murder on your battery life. The disadvantages of the knife switch are the
slow opening speed and the proximity of the operator to exposed live parts.
Knife switches are made in many sizes from miniature switches
to large devices used to carry thousands of amperes.
Knife switches consist of a flat metal blade, hinged at one end, with an insulating handle for operation, and a fixed contact.
One form of rotary switch consists of a spindle or "rotor" that
has a contact arm or "spoke" which projects from its surface like a
cam. It has an array of terminals, arranged in a circle around the rotor, each
of which serves as a contact for the "spoke" through which any one of a number of different electrical circuits can be connected to the rotor. ”