These 5mm LEDs are similar to our G18765 red flashing LEDs, however they reversed the indicator (short lead and flat side of lens) that usually is the cathode, but on these LEDs it indicates the anode. Everything else is perfect and the LED flashes nicely on 3.6VDC at 30mA. Just remember that on this LED the shorter lead and flat side of lens is the anode (+). Sold in packages of 3.