Ultra-efficient Class-D amplifier with lightweight (17.6-pound) design Dimensions: 18 inches (H) x 9.1 inches (W) x 11.2 (D) inches 8-inch custom high-output woofer with 1-inch compression driver for full, even projection Removable lithium-ion battery with 12 hours of life; tri-colored battery life indicator Bluetooth connectivity with linking for a second Thump GO and easy streaming control via the Thump GO Connect App 2-channel digital mixer with XLR output and gain balance for PA use 4 application-specific speaker modes; indoor/outdoor voicing modes Smart input and thermal limiters; "Music Ducking mode" for automatically lowering Ch. 2 level when Ch.1 receives signal Great for outdoor spaces with built-in pole mounts Durable lightweight molded enclosure, powder-coated steel grille, and 45° resting monitor angle