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Control switch Of Flashlight
The original 1890's flashlights used a metal ring around the fiber body of the flashlight as one contact of a switch, and the second contact was a moveable metal loop that could be flipped down to touch the ring, completing the circuit. A wide variety of mechanical switch designs using slide switches, rocker switches, or pushbuttons have been used in flashlights. A common combination is a slide switch that allows the light to be left on for an extended time, combined with a momentary button for intermittent use or signalling. Since voltages and currents are low, switch design is limited only by the available space and desired cost of production.

Electronic controls allow the user to select variable output levels or different operating modes such as pre-programmed flashing beacon or strobe modes. Electronic controls may be operated by buttons, sliders, magnets, or rotating control rings. One model of flashlight includes an acceleration sensor to allow it to respond to shaking. At least one manufacturer allows user programming of the features of the flashlight through a USB port.