NOTE: Due to Its Mini Enclosure, This Pedal Has No Battery Option, and Requires a Standard 9V DC Power Supply to Operate (Not Included)The TinyTune Pro Stage chromatic tuner pedal takes everything we learned from the original award-winning TinyTune, and upgrades it in some major ways...So what's new in the TinyTune Pro Stage?Completely redesigned from the ground up, the TinyTune PS is faster and more intuitive than ever. Utilizing Weighted Pitch Sampling Technology, the tuner samples an average of several points in time, serving up very steady tracking and precise tuning. Featuring an upgraded LED display, TinyTune PS makes tuning more comfortable in any environment, indoors or out. A new relay based True Bypass circuit ensures your tone remains pristine and uncolored, while an electronic quiet switch provides reliable, "pop" free switching, stomp after stomp. Improved tuner settings include a wide Pitch Calibration range of 420-459Hz, and a Flat Tuning mode for those that like to rock Drop tunings, down to seven semitones below standard. Finally, the TinyTune PS stores your preferred settings, even after it is powered down. From reference pitch to flat tuning mode, you only have to set these parameters once, and the tuner will recall them the next time you use it.TinyTune PS Pedal Tuner Features:A broad detection range from A0-C8 with +/- 0.5 cent accuracy100% true bypass output keeps your tone intactBright LED display with 2 display modes; meter, strobe styleReference pitch calibration of 420-459HzFlat Tuning supported up to 7 semitones below standard pitchTuner automatically mutes when the tuner is onRugged metal chassis for ultimate durabilityDimensions: 3.7 x 1.2 x 1.5 inches ; 5.1 ouncesRequires a standard 9V power supply (not included)Full 1-Year Warranty makes the TinyTune PS a smart investment