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Cable length: Approx. 20cm (7.8 inch). Dimensions of 9 Volt Battery Holder: 5 * 2.6 * 1.7cm (1.9 * 1 * 0.6 inch). Standard 2.1mm x 5.5mm Center positive male plug connects directly to the Arduino board. Can also used in transistor radio (early products), intercom, remote control toys, smoke alarm, wireless microphone, multimeter and other electronic need 9V battery. Make your Arduino projects portable with these 9V battery snaps and powering your project. Package Included: 2Pcs 9v Battery Snap Clips with holder (9V battery is not included)