The walnut Heritage Groove Wireless Speaker from Klipsch blends size, style, and functionality, allowing you to bring big sound wherever life takes you. It utilizes Bluetooth technology for wireless devices, but is also equipped with a 3.5mm input jack for wired components. To aid in hands-free calling, there is an integrated microphone. Technically, the Heritage Groove delivers a peak output of 20W, a frequency response of 65 Hz to 22 kHz (±3 dB), a maximum acoustic output of 96 dB at 1.6', a single 3" high-range full excursion driver, and two side-firing passive bass radiators. Power is provided by a 7.4V / 2-cell / 2200mAh lithium battery that can last for up to 8 hours before recharging is required. Included is a micro-USB charging cable and a charging adapter.