Features: Bright, Clear and Easy to read LED screen Highly Accurate & Ultra Responsive 360 swivel for multiple positions 5 settings Chromatic/Guitar/Bass/Violin/Viola Works well with Brass and Woodwind Instruments Left side glows red ( perfect for night club gigs) lets user know the correct position of tuner 430 HZ- 450hz Pitch Range Auto Power off extends battery life Green you're in and Red you're out (Simple to understand) Wide detection range A0-C8 Accuracy +/- 0.5 cent Microphone or Piezo (vibration) tuning method Calibrates for Alternate tunings