JBL's PartyBoost is why I'll never buy another Bluetooth speaker - Android Authority
Amazon.com: JBL Charge 3 Portable Bluetooth Waterproof Speaker - Black : Electronics
How to Link JBL Speakers
JBL Charge 5 Buttons Explained (Plus Special Button Combos)
JBL CHARGE 5 - Portable Bluetooth Speaker with IP67 Waterproof - Camo | eBay
JBL Xtreme 3 Portable Bluetooth Speaker with IP67 Waterproof, Black, JBLXTREME3BLKAM-B - Walmart.com
Amazon.com: JBL Flip 6 - Portable Bluetooth Speaker, powerful sound and deep bass, IPX7 waterproof, 12 hours of playtime, JBL PartyBoost for multiple speaker pairing for home, outdoor and travel (Black) : Electronics