Fuller, richer sound with more bass due to larger amp and driver Five-Step Battery Level Indicator so you'll always know how much juice you have left Larger 1.25” Tweeter USB-C Charging Input and Output for charging your phone Three more battery cells mean a monster-sized 9-cell Lithium-Ion Battery TURTLEBOX is loud, portable, waterproof and rugged. Get crystal clear, distortion-free sound at up to 120dB that you can easily carry with one-hand. Waterproof - IP67 Fully Waterproof & Dustproof, Impact Resistant. Waterproof Cap with Tether to Protect Port Openings from the Elements. Stainless Steel Hardware for Corrosion Resistance. Sound Designed for Outdoors - Our Frequency Curve Creates Sound that Cuts Through Wind and Travels Distance. Big Battery Pack - 20 hours of music at easy-listening volume and 6+ hours at max volume. 85 watt-hour built-in Lithium-Ion battery pack (9 cells); USB-C Charging Port. Charges your Phone - USB-C Output makes the Turtlebox a Portable Power Pack. Bluetooth Stereo Pairing - Wirelessly Connect any Two Turtlebox speakers for True LEFT/RIGHT Stereo Imaging. Packs a Punch - For its Big Sound, the Turtlebox is Extremely Portable, Lightweight and Compact. Comfortable Rubber Handle and Large Rubber Feet. Dimensions: 11.5" W x 6.5” D x 8.75” H; Weight: 10 lbs (about the size of a lunchbox) Marine Grade Speaker - 6"x9" Polypropylene Speaker Cone with Rubber Surround and High-Efficiency Driver; 1.25" tweeter LED Control Pad - Illuminated LED Rubber Control Pad including Volume Control and Track Skip Five-Step Battery Level LED Indicator - Works just like a fuel gauge on your car, you’ll always know how much juice is left Tie-down Anchors - Located on both sides for use with 1” straps. Auxiliary Output - Standard 3.5mm