My dad bought a monster brand speaker that rolls around like a suit case it is super loud. You can use a USB or Bluetooth on it. Also had an antenna and power cord. You charge it up and it will last several hours before needing to be charged again.
https://m.samsclub.com/ip/rockin-ro...24474&wl13=&wl15=41076061894&wl17=1o2&veh=sem
https://m.samsclub.com/ip/rockin-ro...24474&wl13=&wl15=41076061894&wl17=1o2&veh=sem