4 clip mounting grow lights. Three have four probes and one has three. Blue, red, and combo light. They do plug into a usb block. Two have blocks two don't but they all work in all the blocks. 3, 6, 9 hour timers. The clips and adjustable arms make it easy to ensure adequate coverage of the plants. I bought these for $30-$40/each. I changed my system this year so that's why I am selling. I used a multi usb block and had them all working at once. Cash only. Pick up in Saanich near Panama Flats