The 9v Battery Snap Connect is the perfect companion to any 2.1*5.5mm female power jack. Whether you need to hook up to an Arduino/Geekduino Board, a Female Pigtail Lead or the AX/MX Power Hub, this cable has you covered. The tail is 10" long. Powering your project with a 9 volt battery has never been this easy. The 90 degree angle plug lets you hook up, even in tight spaces!