Features: LR03 Battery box can be spliced battery box holder,easy parallel or series connection to power your devices Parallel and series connection need to connect with wire, for a variety of dry-cell battery electronic devices Can be used for toy, LED lights, electronic clocks, etc., can also be used for physics electronic teaching New battery slot for experimental teaching, 1 battery slot, can be combined at will. Enhances your physics and electronics teaching with our Battery Holder, a practical accessory that simplifies the complexities of electrical circuits for students. Specifications: Individual Size Length 56x17x13mm/2.2x0.67x0.51in For Battery Holder Quantity： 1PC Package Includes: 1PC Battery Holder note: Due to problem of light effects,there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurements