Very bright LEDs and VERY loud beeping sound. Easy to solder, mounting holes are very convenient to just screw directly to the stands. Good thick wires are included. I have a drone that is working great so far and I have another as a backup. The programmable LEDs make every other color I have so the bottom two will glow blue and the top two will turn red when disabled and the top two will turn blue. turns them all blue when they're armed.