The BOSS KATANA-100 is a combo guitar amplifier, with a single 12-inch speaker. A step up in power from the 50 watt KATANA, but only slightly heavier to carry around. The KATANA range from BOSS all feature 5 classic guitar-amp characters to choose from to base your sound on. Very easy to use, and sound great. The KATANA-100 includes a total of 58 FX - including some BOSS classics such as tones from the Phaser 90E and 117E Flanger.