An LED having two pins that handle contingencies of open, static electricity, and surge comprises an LED cell, a thyristor, such as SCR, with three electrodes arranged in series connection to the LED cell, a transistor for a gate of the thyristor to trigger signals, and a voltage detecting circuit. When the LED cell breaks due to open, a proper current is acquired via the voltage detecting circuit so as to trigger the SCR, thereby providing a substitute current route that allows the rest of the serially-connected LED cells to keep lighting. When static electricity or surge occurs at two ends of the LED cells, the SCR provides a route to guide the static electricity or the surge, which protects the LED cells.