DC Reverse Polarity Adapter Changer Female-to-male 5.5mm/2.1 music 9V 12V Cable
The tip size on these adaptors is 5.5x2.1mm, this is the most commonly used tip size and found on 1000's of devices. 5.5X2.1mm to 5.5X2.1mm DC Power Plug Tip Adapter Converter Reverse Polarity. 15cm cable length.