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Amber LED Strobe Lights Features:High quality with bright lightness for safe lighting during running.Built in flasher and heat sink - no external flasher needed.18 select-able flash combinations; Last pattern memory recall.Synchronization between multiple units.Energy-saving with low heat power consumption.Easy to install with stable performance.Universal fit for all 12-24V vehicles etc;Wire:Red: "+" positive poleBlack: "-" negative poleYellow: Pattern Selector. The yellow wire to black for one second to change patterns.White & Gray: Synchronization. The white wire to connect the gray for synchronization.