A range of 10mm LEDs which have a built-in blinking IC & a blinking frequency from 3 Hz to 1.5 Hz within an operating voltage of 3.5V to 14V. The cathode is denoted by the short lead. All types have a diffused lens & a viewing angle of 60anddegree except for Order Code UK47B which has a water clear lens & a viewing angle of 40anddegree.