Sit next to me and I will tell you! Oh stay right there. The one switch is a coil split. The other little switch is to add a seven way switch system to the regular five way switch. When the main is in the first or most forward position you can have the neck pick up and the bridge pick up on. Click the main switch to the fourth position all pick ups are on. Click the little switch back or off and the pick ups work as normal. I have it wired for out of phase but Radio Shack shut down and I need another little switch to complete it. I'm not a creative shopper to just buy a switch somewhere else.