Harley Benton CPT-20, Chromatic Floor Tuner for Guitar and Bass, LED/LCD Display for fast and precise tuning, True Bypass, Tuning range: A (27.5 Hz) up to C (4168 Hz), Accuracy: ±1%, Power consumption 33mA, On/Off switch, 6.3 mm Jack in and output, Dimensions: 95 x 46 x 49 mm, Weight: 112 g, Suitable DC power supply: Article Nr #409939# (not included)@+*Note:* Not operable with batteries!@+@+