Keyestudio KS4028 Manual page 242

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only allow current to flow from one anode to the cathode. The
components will be damaged if LED is directly connected to the power
supply. It's essential that a certain resistor must be connected in series in
the LED circuit.
(2) Yellow LED：
Working DC 3.3-5V
Voltage:
Working < 20mA
current：
Max Power： 0.1W
Control Digital ports
Ports: (digital
input）
Working -10 ° C ~
Temperature +50°C
Display Yellow
Color：
242