This is the Boss Acoustic Singer Pro- a 120 Watt acoustic amp with custom-designed 8-inch woofer and dome tweeter. It's got a dedicated guitar channel with Acoustic Resonance to restore natural tone to stage guitars with piezo pickups. With built in effects (chorus, delay, and reverb) and a Harmony function, the amp automatically creates smooth and accurate vocal harmonies via real-time key/chord analysis of the guitar input. What's even cooler is the built in looper for practicing, brainstorming, and intensifying live performances- something that not every amp can offer. To top it all off, this Boss offers independent anti-feedback controls and a USB output for direct recording to a computer.