JBL's PartyBoost is why I'll never buy another Bluetooth speaker - Android Authority
JBL Flip 5 Portable Waterproof Bluetooth Speaker with 12 Hours of Battery, Powerful Sound and Booming Bass, Lightweight, Stand Vertical or Horizontal, JBL Partyboost Compatible - Gray, JBLFLIP5GRY : Buy Online at
JBL Charge 5 Buttons Explained (Plus Special Button Combos)