• Strobe Mode - the note played lights up in green.Red LEDs chase around the rotary display. As you tune, they slow down. When the red LEDs stop spinning, you are in tune. • Sweep Mode – the note played lights up in green. A red LED will appear to the left of the green LED if flat; to the right if sharp. When only the green LED is lit, you’re in tune. • Tuner may be calibrated from A435-A445 | • Multi-tool features: winder, cutter, string stretcher, and bridge pin puller. • Runs on one CR2032 lithium battery (included) |