4 Channel Radio Control Relays

[NT2C]

I just recently discovered these bad boys on Amazon, purchased a few and have been having all kinds of fun with them.

They can handle a 10 amp (resistive) load, have excellent range, and work well at typical household or automotive voltages. At just $20 each they're cheap enough to stock up on and they're useful for a host of projects.  I'm using one to control the rear floodlights on the back of my trailer (two of them, both LED, one per channel) with the remaining channels used to turn on/off the warning strobes and step through the different strobe patterns.