Two-color LED with two leads has two LEDs in the common housing. At one polarity of the applied voltage, as a result of the current flow, one LED is illuminated. When the polarity of the power source is changed, another one is illuminated. The two-color LED with two is convenient to use as an indicator of the presence of AC voltage, since the amplitude of the reverse voltage on each of them at any time does not exceed 3 V. This is explained by the fact that both LEDs are connected in parallel, but also counter to each other Therefore it is sufficient to use only a current-limiting resistor.