Made of hard leather. Excellent material, fine workmanship. It is an environmental 9V battery buckle. Wire Length: 5cm. Color: Black.
9V Battery Connector
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Compatible with Arduinos, development boards etc. Useful in various applications. Plug a 9V battery into 9V to 2.1mm Barrel Jack's one end and connect the other end to anything with a 5.5x2.1mm, center-positive barrel jack. Use it to battery-power device that needs 9V and has on-board barrel jack.
9V to 2.1mm Barrel Jack