I'm using two [14.8 V Li-po batteries][1] each to power [frequency generators][2] that are connected to piezo speakers.
 
I plan on adding XT60 connectors to the wires of the frequency generator so that the power supplies can be easily disconnected/connected when charging is needed.

For the button/switch: My idea is that once it's triggered, the generators emit ultrasonic frequency. What do you think is the best way to configure the button/switch?

I'm not sure how I could make it so that the button is connected to both units and maintains an even voltage input from the power supplies. 


  [1]: https://www.amazon.com/dp/B09JSC88TF
  [2]: https://www.amazon.com/Kemo-Electronic-4330881478-Ultrasonic-Generator/dp/B00NRH95AY