JBL Pulse 4 - Portable Bluetooth Speaker with 360 degrees LED lights, powerful sound and deep bass, IPX7 waterproof, 12 hours of playtime, JBL PartyBoost for multiple speaker pairing (White) : Electronics
JBL Pulse 3 review: Still fun, still a killer speaker - SoundGuys
How to Turn On Bass Boost on JBL Charge 3 - Tom's Tek Stop