Product Highlights Brand BOSS Compatible Devices Personal Computer, Headphone, Smartphone Connectivity Technology USB, AUX Number of Channels 3 Item Weight 7 Ounces Built-in headphone amp lets you tune, warm up, and check your effects in private Built-in metronome with selectable rhythmic patterns and volume control Headphone amp with speaker simulator for monitoring effects Three tuning modes (Chromatic, Guitar, Bass), Flat Tuning function, and ACCU-PITCH verification with an audible beep MIX IN allows jamming with an external music-playback device (iPod, etc.)