The 16 foot add on kit of RGB led cove lights come with everything you will need to extend the length of your cove lights. You will receive onr 16 foot section of RGB tape lights, one indoor RGB amplifier and one 12 volt 60 watt power supply. The tape light cove lights dimensions are 3/8 inch wide by 1/4 inch tall by 16.2 feet long. The cove lights can be cut every 2 or 3 inches depending on the color. The cove lights consume 2.2 watts of electricity per foot and product 146 lumens of light per foot. The cove lights come with a 3M double sided tape for easy installation. The 12 volt 60 watt power supply is a UL listed power supply that plugs into a standard electrical outlet. The dimensions of the power supply is 5 inches long by 2 inches wide by 1.5 inches tall. The power supply can be placed in the cove or you can extend the lead wires out if you need to. To install these lights there is some minor wiring you might have to do between the power supply and the lights so we suggest you have some low voltage wire along with the crimping electrical connectors or wire nuts on hand.