AspenTek 9v Battery Clip Snap Accessories with 2.1 X 5.5mm Male Dc Plug for Arduino(5 Pack) Plug Type: 2.1 x 5.5mm Male to 9V Battery Clip Length:12cm 4.72 inch Material(External): Plastic and copper wire Great to use for LED strip light or arduino Package Included 5 pcs 9v Battery Clips (9V battery is not included)