Keyes RGB module

So I got this RGB module with my sensor kit …

Now they want me to hook up RGB leads to arduino pin 11/10/9 respectively, but there is a V for the last pin, and the link says it is vcc, now I don't see a ground? Has anyone experience with this thing?
I kinda thought RGB would be my pins and the last one should be a ground.
So am I reading this wrong?
I appreciate all help , so thanks in advance.

That looks like a ridiculous product, does it really have four pins and a three-conductor cable ?

Anyway, to answer your question, the V pin is the power supply to the LED. You connect that to the power ( probably +5 V ). . Then, to make the colours light up, you connect one or more of the other pins to ground, making a path for the current to flow though the LED.

If you connect the pins other than the V to separate digital outputs of the arduino, then you would set the output pin high to keep the led off, and low to turn it on. This seems counter-intuitive but that is probably how it works.

http://forum.arduino.cc/index.php/topic,22413.0.html

There is more explanation of it, at this previous topic.

michinyon:
That looks like a ridiculous product, does it really have four pins and a three-conductor cable ?

LOL That is what I thought. Yes I actually got it in a kit, and there are no 4 pin connectors. I thought it was strange. Common Cathode...interesting. Well I will give it a go, I didn't want to connect anything, until I knew for sure.
Thank you very much for the reply and the link.