BOSS DB-90 Talking Dr. Beat Metronome w/ Power Supply CREATE DIVERSE BEATS - The DB-90 Dr. Beat's Note Mixing function allows you adjust the levels of 5 different values to create a variety of fresh beats. BOSS utilize realistic PCM drum patterns in this electronic metronome. PLAY AND LEARN - The onboard Rhythm Coach helps you build your accuracy, endurance and speed. It has four training modes wherein you can chart your progress as you play. OFFERS MASSIVE MEMORY - You can store up to 50 different metronome and 10 reference tone settings in the DB-90's memory storage. MONITOR YOUR BEATS - You can connect the DB-90 to a guitar or bass directly. You can also monitor your sounds via connected headphones. INCLUDES - BOSS DB-90 Dr. Beat Electronic Metronome. Blucoil Power Supply Slim AC/DC Adapter for 9 Volt DC 670mA with US Plug.