Features: The LR6 AA Battery with 5.5x2.5mm Input (inner positive/outer negatives) provides safe 0V nonconductive power transfer, serving as an ideal battery placeholder for connecting adapters to electronic devices. Crafted from steel, this uncharged conductor features selectable 5.5x2.1mm/5.5x2.5mm interfaces for secure power supply solution without actual battery functionality. Perfect for electronics enthusiasts and parents seeking permanent power solution for children's toy, LED lamps, or remote controlled devices requiring stable input. Effortlessly power desk lamps, cooling fans, remote car, and projects by converting standard adapters into permanent battery compartment replacements. Eliminates battery leakage risks while maintaining device portability, offering users a durability alternative to batteries in low power electronics. Specifications: Component: Steel Color: red, yellow, green Height:Approx. 5mm/0.197inch Diameter:Approx.14mm/0.55inch Cord length: Approx.14cm/5.51inch Interfaces: 5.5x2.1mm, 5.5x2.5mm 6Option Type; Package Includes: 1pc AA Battery Placeholder note: Please allow 1-10mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.