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Cable Length: 14cm / 5.5", red (+) and black (-) cable for polarity identification. HIGH QUALITY - Battery case made of thick plastic to prevent cracking, the battery button is made of pure copper and plating with nickel, rust and oxidation resistant. Battery Holder with On / Off Switch This battery holder with cover and with ON/OFF switch, can be used as a perfect external power source. (Battery type: 1 x 9V standard battery) Battery type: for 9V battery, battery case size: 6.8 x 3.4 x 2.1cm / 2.7" x 1.3" x 0.83"(L*W*H). Practical: Easy to remove cover and install the battery, and convenient for DIY electrical circuit work.