6VDC 500MA 2.1MM FEMALE TIP WITH A
3.5mm Mono Dc Plug To 2.1mmx5.5mm Female Positive To Positive Tip
Tip: Can be used to convert a regular female adapter to except into 3.5mm mono plug
Works great on certain Mr. Christmas tree toppers as seen in picture above  products using 6vdc adapter with 200ma minimum.