The RF-YUB191TS-AE is a surface-mount device (SMD) light-emitting diode (LED) manufactured by REFOND. This LED has a yellow color and is capable of producing a brightness of 150 to 280 millicandelas (mcd) with an efficiency of 1.8 to 2.4 volts. It measures 1.6x0.8x0.7 millimeters and has an approximately 140° viewing angle. This LED is ideal for many electronics applications due to its small size, high efficiency, and bright color.