The SN-8 Snark Super Tight Chromatic Instrument Tuner provides a solid stay-put clip-on direct connection to your instrument. Has more precise tuning, and advanced features! Power saving feature: tuner display will dim after 5 seconds of no sound detected. This conserve battery power. Display returns to normal brightness when a note is detected. If no notes are detected for 2 minutes, tuner will shut off. Improved Full Color visual display with larger improved frequency lines making it an easy read. It can be used in practice or live giging situations. Other features: tap tempo metronome, pitch calibration, and a transpose feature for tuning guitars with capo. Internal vibration sensor detects notes by clipping on directly to instrument.