Vktech 10Pcs AAA to AA Size Cell Battery Converter Adaptor Holder Case Switcher Made of environmental material Fine workmanship, standby specification, 1xAAA battery can replace AA battery to use Nothing complicated, just stick the AAA battery in the converter and it's the same as a AA battery AAA to AA Battery Holder is a gadget to keep close at hand, at home, at the office, at the campsite