#4-MAIN UNIT WITH BATTERIES ONLY- please STUDY MY ACTUAL PICTURES of this item NOT THAT GENERIC STOCK ONE to see what?s included with this sale. Do your research before buying to be sure it's what you need, there is a restocking fee for my items. If you have any questions, please contact me BEFORE buying. Pay attention to the posted estimated delivery time, my items are shipped USPS insured for secure delivery. Thanks Additional Details ------------------------------ Product description: Tuner delivers outstanding functionalityNewly designed needle-style LCD meter with excellent response and wide detection rangeThe TM-50 features extremely fast response to audio input from wind and other instruments, and the redesigned meter display method allows the pitch to be accurately and instantly shown without any time lag. Wind players will no longer experience the problem of their pitch changing spontaneously before it can be displayed accurately; this ensures that you'll be able to develop stable and drift-free pitch.The detection range is extremely wide, extending from C1 (32.70 Hz) to C8 (4186.01Hz) which covers the note ranges of wind, string, and most other types of instruments. Even potentially difficult instruments that have a low pitch and numerous overtones can be tuned accurately, thanks to Korg's proprietary high-precision technology. The built-in high-sensitivity mic also allows easy and accurate tuning of acoustic instruments such as guitar and ukulele; alternatively, you can use the separately sold CM-100L contact mic to send the vibrations directly to the tuner for even greater reliability.The Sound Out function produces a reference tone from the internal speakerIn addition to visual tuning using the meter, you can use the Sound Out function to produce a reference tone from the internal speaker or headphones, and tune by ear. You can specify the reference tone in a three-octave range from C3 (130.81 Hz) to C6 (1046.50 Hz) which covers a wide variety of instruments.In response to the audio input, the Sound Back function plays the nearest reference tone from the speaker while showing the discrepancy in the meter - ideal for developing your sense of pitchThe tuner can be used not only to detect and inform you of pitch discrepancies, but also as a tool that helps you develop the ability to hear and produce the correct pitch. That's why the TM-50 provides the proprietary Sound Back function that until now has been featured only on Korg's high-end