The A3T retains the simple and small features that are big on sound and intuitiveness. The compact preamp has a 4-band rotary EQ, low battery LED and a wide range chromatic tuner. The EQ provide quick and accurate changes. The chromatic tuner is fast and has a range that will be welcomed buy customers that want to tune a full step down from standard â€“ great for open tunings and 12- string guitars too! The tuner's read-outÂ shows all notes, including sharps, great for standard and open tunings. The tuner has a single window showing the pitch and four LEDs showing the half step, sharp, flat and in-tune. 9-volt battery powered HZZLess circuit.