Product description: dc 5.5x2.1mm male connector 8 x AA 12V battery holder case box wired ON/Off switch with cover Specification: Product name: battery holder case, 8 x 12V AA battery case Material: high quality plastic, metal Spring clip design: Easy to install your battery Output voltage: 12V Battery type: 8 x AA 12V Plug type : DC 5.5mm x 2.1mm Male Size: 12.6 x 7.1 x 2cm/5" x 2.8" x 0.8"(L*W*H);Cable Length( Each ) : 14cm/5.5" Package includeds: 3 * 8 slots AA 12V battery holder case box with dc 5.5x2.1mm male connector ON/Off switch with cover Note: 1: Any problem,please contact us directly via amazon platform. any question will reply within 24hrs. 2:Please do not use this 12v battery pack for high max currect output.