Expensive for an LED turn signal but more options than most. Plugs into a cigarette lighter socket which has two switches, an on/off switch and a momentary switch to change the flash mode. The selected flash mode stays in memory after turning off, so you don't have to cycle through the flash patterns every time, which is very convenient! We use two of these on a tow truck so we cut the lighters off and wire them together. There are 3 wires - power, ground and short term power to change mode. Very easy.
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