adapter only, battery not included 12 inches , 10 AWG wires installed, marine grade tinned copper, UL rated Note:This is not a charger or converter, it only outputs battery voltage and power directly from your battery. Do not buy/use this without proper understanding how to protect your battery, as it is application specific we do not have/provide any instructions Warning: To use this adapter properly, we recommend using a fuse thats rated about 30% higher than the max current you expect to draw. We also recommend adding a low voltage disconnect circuit or a timer to prevent the battery from dropping past low voltage threshold (which will damage the battery or shorten its life span); (Max battery voltage/4.2)*3.3 = typical low voltage threshold. To protect your device you should convert your voltage using a DCDC converter to match your device's acceptable voltage range. We do not recommend buying our adapters without fully understanding how to use it properly, protect the battery, and the device you intend to power.