Mine came red and had 4 pins. Didn't work with the nova, made me pretty mad that I had to order a different thing and couldn't fly yet.At that price it would be nice to have a 4 pin DF13 connector cable for I2C connector included or at least sold separately for connecting to HKPilot Mega V2.5 (or APM2.5). PRODUCT ID: 074000072 is pretty much the same, but the included cable is also no good for APM2.5. You can visit copter.a r d u p i l o t DOT c o www.link there are very detailed instructions how to align the external compass and how to disable the internal compass by cutting a track on-board the APM2.5, setup details, etc.This is exactly what I needed for my 550 DJI clone, I was getting 40 degrees shift on my mag this has reduced to zero thanks to being able to move the mag away from all the electrics. As a bonus my gps seems happier, fitting was easy just had to cut trace connection from the mag and change one line on the sketch. picture in files tab of my setup.