With the JBL Partybox 310 you can enjoy a powerful sound at your party. You adjust the bass, mid and low tones to how you want it. 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. When the built-in battery fails after 18 hours, connect the speaker to mains power. Even when the sun goes down, you just keep partying. The control panel on the speaker lights up automatically when it gets dark. Stream your favorite playlist via Bluetooth with your smartphone or tablet or with a USB stick via the USB port. To listen to stereo sound, connect 2 party JBL speakers together with True Wireless Stereo technology.