Component/Bone Conductor Transducer help needed please!

Hi there! I am new to this.

For a project, if I want to run 4 of these:
Bone Conductor Transducer with Wires - 8 Ohm 1

What else would I need? i.e
Amp
Battery
Charger
Switches
Case
Anything else?

Would they run off this amp?

With this charger?
adafruit-micro-lipo-w-microusb-jack-usb-liion-lipoly-charger

But Powered by what battery?

Help very much appreciated!

Stefan