Hybrid subwoofer and Bluetooth speaker all in one for the ultimate performance and convienence High-performance JBL Sound Quality with powerful 100W amplifier Wireless Bluetooth streaming Adjustable audio settings to maximize the bass performance in-vehicle along with balancng the sound performance and battery life Built-in Rechargeable Battery with up to 8 hours of wireless music playback *Please Read: The BASSPRO GO receives is power ONLY from the harness that is connected to the car battery. When connected to the harness, the car battery will charge the internal battery so that it is ready to be used as a portable the next time you need it. When removed from the harness, the full-range portable speaker runs on the internal battery. It cannot be charged via either of the USB (A or C) jacks. It will be charged the next time it is connected to the harness in the vehicle.