P3S SAE 2.5mm ID x 5.5mm OD Barrel Adapter
The Plug Adapter is a 3 inch, 18 AWG zip cord cable (total length is 6.5 inch).
It has a standard SAE two prong connector on one end and a 2.5 mm ID x 5.5 mm OD barrel plug on the other end.
The SAE plug connects directly to the solar panel and the barrel plug connects to various electronic devices and battery packs.
Please note that the SAE positive is the barrel end, and the SAE negative is the shielded end.