With the JBL Partybox 310, you enjoy a powerful sound at your party. You can adjust the bass, middle, and treble tones to your liking. The synchronized light show brings the party to life. Thanks to the telescopic handle and built-in wheels, you can easily move the large speaker. If the integrated battery runs out after 18 hours, you can connect the speaker to the power grid. You can keep partying after the sun has set, because the control panel on the speaker lights up automatically as soon as it gets dark. Stream your favorite playlist from your smartphone or tablet via Bluetooth, or with a USB flash drive in the USB port. To listen to stereo sound, you can pair the 2 JBL party speaker to each other with the True Wireless Stereo technology.