7 color led

do u mean how many colors?

if so it has red, green, purple, and i believe there are three different blue one darker than the other

I would start out by checking the voltage on the four wires - my first assumption would be there is one ground and three signal wires.  By changing the combination of power / no power on the three non ground wires you would have 7 possible colors and an "off"

0 0 0 G "off" and ground

0 0 1 G color 1and ground

0 1 0 G color 2 and ground

0 1 1 G color 3 and ground

1 0 0 G color 4 and ground

1 0 1 G color 5 and ground

1 1 0 G color 6 and ground

1 1 1 G color 7 and ground

I would start there and see what happens.