Battery interrupters let you use a switch to turn on and off most battery-operated toys and devices. An inexpensive and easy way to use toys or devices you already own! Simply insert our battery interrupter between “AA”, “AAA”, “C”, or “D” batteries and make most items switch activated. Interrupters will only work in devices/toys that have an on/off switch that you slide or move to the ON position. They do not work with toys that are squeezed, have a button that must be depressed to make it “go”, use a remote control to activate them, or use a 9-volt battery. Choose the size based on the battery size your device uses.
More information: https://www.adaptivetechsolutions.com/pd-battery-interrupters.cfm