Has some wear but still works great. The AC adapter is 100V but I've never had any problems using it here in Hawaii. TU-2: Chromatic Tuner The BOSS TU-2 Chromatic Tuner incorporates BOSS' world renowned TU-Series tuner technology into an ultra-convenient stompbox design. For the first time ever, guitarists and bassists can now tune their instruments with unrivaled accuracy and an unmatched tuning range--with just a single stomp. BOSS world-renowned TU-Series tuner accuracy in a convenient stompbox design Mute/Bypass select for silent tuning with a single stomp 11-point LED indicators and new "stream" meter display tuning discrepancy via speed and direction of LEDs (speed of LED movement gets slower as pitch becomes more accurate) 7-segment LED displays string and note names, easily visible on dark stages Seven easy tuning modes include Chromatic, Guitar Regular, Guitar Flat, Guitar Double Flat, Bass Regular, Bass Flat, Bass Double Flat Tuning mode setting and display style choice stored in memory Adjustable reference pitch from 438 to 445Hz 8-octave tuning range--the widest in its class Footswitchable Tuner Off mode preserves battery life by disabling LEDs Reference Pitch A4 = 438 to 445Hz (1Hz step) Tuning Range C0 (16.35 Hz) to C8 (4186.00 Hz) Tuning Accuracy +/-3 cent Input Impedance 1 M ohms Connectors Input, Output, Bypass, DC In Power Supply DC 9 V Dry Battery, AC Adaptor (PSA-Series: Optional) Current Draw 55 mA (Max.) Accessories Dry battery 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 0.4 kg 0 lbs. 15 oz.