The new JBL Charge 4, a portable stereo speaker offering best-in-class sound with dual drivers and twin passive radiators that deliver deep, accurate bass so powerful that you can actually see them trembling. Featuring a 7500mAh Li-ion battery that can play up to 20 hours of music even as it recharges your smartphone or tablet, the Charge 4 is built to outlast all-night parties - as well as charge other portable devices by way of its USB port. What puts JBL Charge 4 at the head of the competition is its outstanding Bluetooth capabilities. You can easily connect Charge 4 to any Bluetooth-enabled device by giving the portable's Bluetooth key a single short press. It also comes with a hands-free speakerphone conferencing microphone complete with noise and echo cancelling technology. Access the speaker's Bluetooth Social Mode, freeing up to three different users to wirelessly link their smartphones or tablets to a single Charge 4. 7 1/5"W x 3"D x 3"H.