Brand: Treblab. MPN: HD77BL. The TREBLAB HD77 Bluetooth speaker loud features a unique design that lets it pump out sound in every direction enveloping you in 360° of HD sound with Dual Bass technology which is the unmistakable feature of the HD77. The TREBLAB HD77 Bluetooth speaker outdoor is made to travel thanks to its sturdy high-quality build. The HD77 is water-resistant which makes it feel at home in any environment from your living room or the backyard to the rugged outdoors.