ST-2: Power Stack Authentic Amp Stack Sounds from a Stompbox Nominal Input Level -20 dBu Input Impedance 1 M ohm Nominal Output Level -20 dBu Output Impedance 1 k ohm Recommended Load Impedance 10 k ohm or greater Power Supply DC 9 V: Carbon-zinc battery (9 V, 6F22) Alkaline battery (9 V, 6LR61) AC Adaptor (optional) Current Draw 36 mA (DC 9 V) * Expected battery life under continuous use: Carbon: 3 hours Alkaline: 10 hours These figures will vary depending on the actual conditions of use. Accessories Owner's Manual, Alkaline battery (9 V, 6LR61) Option AC adaptor (PSA series) Size and Weight (incl. battery) Width 73 mm 2-7/8 inches Depth 129 mm 5-1/8 inches Height 59 mm 2-3/8 inches Weight 440 g 1 lbs. * 0 dBu = 0.775 Vrms In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.