Easily tune your guitar or bass on stage with this chromatic pedal tuner from Monoprice! This tuner is designed to fit into your pedal rack and features a heavy-duty metal construction and activation button. It has two 1/4 inch TS outputs normal and bypass. The normal output is muted whenever the tuner is activated and the bypass output ignores the tuner completely and outputs whatever comes in over the 1/4 inch TS Input jack. It has a tuning range from A0 (27.5Hz) to C8 (4186Hz) and is accurate to within 1 cent. It can be calibrated to between 436 - 445Hz in 1Hz increments and supports the application of 1 2 or 3 flats to the tuning. The pedal is powered with either a 9V alkaline or heavy-duty battery or with a 9VDC power adapter. Batteries and power adapters sold separately. Specifications Tuning Range: A0 (27.5Hz) - C8 (4186Hz) Accuracy: 1 cent Calibration: 436 - 445Hz (1Hz steps) Flat: b bb bbb Notes: A A# B C C# D D# E F F# G G# Display: 39 segment FND Input: 1/4 inch TS Output: 2x 1/4 inch TS (Standard and Bypass) Power: 9V battery (6F22 or 6LR61) or 9 VDC AC Adapter (5.5mm/2.1mm/negative tip) Dimensions: 2.9 inch x 4.3 inch x 1.9 inch (73 x 110 x 47mm) Weight: 10.6 oz (300g) (including battery)