Buyer beware because it is definitelt unclear and misrepresented - THIS HAS A BATTERY PACK, NOT A PLUG! From the title and description on this screenshot, it says it works in unison and is only compatible with National Tree Co. prelit trees - I ordered the tree and topper at the same time, only to find out the description for this item is wrong - it looks like at some point the seller started sending out battery operated ones instead of the ones with the special compatible plug-in, so there is no way to get these to sync up on the fading cycles. I even read the reviews prior to purchasing to make sure it was a plug-end (which most reviews confirmed it was, but now I see others have complained about receiving the battery one as well). Disappointed!