2AA To D Size Battery Cell Holder Converter Adapter Switcher Case Box<br>Feature:<br>Buckle design， easy to install batteriesMetal made in pure copper， not easy to rustCan use in water heater， flashlight， radio and so onInstall batteries to the relative side of battery adapterGreat negative pole， reduce resistance and save energyCan install two AA size batteries convert as a D size battery. Also can only install a AA size battery.<br>Specification:<br>Color: Green Rose Red Blue Yellow White Material:  Pure CopperLength: 6 cm \/ 2.36 inchDiameter: 3.25 cm \/ 1.28 inchNet Weight: Approx. 12g<br>Package included:<br>1 x 2AA Size Batteries Conver Battery Case (Not include batteries )<br>Detail pictures: