This adapter one end is a car cigarette lighter female socket, another end is a male barrel connector with 5.5 x 2.5mm male connector. Please be advised that this adapter does not have any electronic circuit inside to change electronic voltage/current/polarity. It only provides physical size and shape conversion.
Barrel connector size on adapter is 5.5x2.5mm. It can be changed to mand different sizes by the optional connector tips from BiXPower.