The Model 2137 Buzzer Beater™Perimeter LED Light Kit has custom PVC extrusions to be housed inside of. Clutter is minimized by the cleanly interconnected PVC. The LED lights are designed to be seen on the outer most part of the glass backboard without interfering with play during the game. The FIBA, NCAA and NBAs most recent recommendations comply with the LED Perimeter Lights. The LED kit includes the following items: LED light strips, adapter cable and 120 or 220 Volt AC power supply with 24 Volt AC output. The scoreboard and shot clock send the signal to turn these lights on and off. Please specify score board and shot clock model as well as manufacturer.