Here is what I found in the
manual:
"4.11. Connector „RGB LED“
Connector for up to three LEDs or one two-color or RGB illumination module
(not included in delivery). High brightness LEDs (3-4 V, 20 mA) may be con-
nected without series resistor, a series resistor is built into the aquaero.
Pin assignment:
Pin 1: VCC LED 1
Pin 2: VCC LED 2
Pin 3: GND
Pin 4: VCC LED 3"