The Behringer Eurolive B115D is a portable 1000 Watt active PA loudspeaker with Class-D power amp technology, built-in wireless microphone capability and 2-channel mixer. Class-D - Massive Power, Perfect Sound Class-D amplification makes all the difference, offering the ultimate in energy efficiency and eliminating the need for heavy power supplies and massive heat sinks. This amazing technology makes it possible to design and build extremely powerful products that are significantly lighter in weight than their traditional counterparts, while using less energy and protecting the environment. Built-in Mixing Capability The B115D's integrated 2-channel mixer features the same ultra low-noise, high-headroom mic preamps that have made BEHRINGER mixers legendary, and the individual Mic/Line inputs accept virtually any level signal you're likely to run across. Variable Input gain controls (with Clip LED) will have you dialing in the perfect level every time. And if you need more coverage, use the convenient Link Output XLR connector to add more active loudspeakers. Extraordinarily Versatile Thanks to its trapezoidal shape, the B115D is suitable for a wide variety of applications, including mounting on standard speaker poles, vertical placement atop subwoofers, or even laid on the side for use as onstage monitor wedges. The B115D's extraordinary fidelity and frequency response make it a favorite of vocalists and instrumentalists alike. Hookup is simple, requiring only a single XLR or ¼ " cable from your mixing console and power. Additional active monitors can be chained together via the XLR Link Output jack on the rear panel.