LED andon and LED stacklight Flashing/Continuous operation lights with built in buzzer option operate by user applying power to the power pair and shorting the provided color control wire to the provided continuous common OR flashing common depending on operation needed. These are ideal for facilities using mechanical relays for activation or wiring to multiple position selector switches for on/off/on activation. LD-52xx-101 light series is the only available with integrated buzzers for optional control.