Unique flexible clamp feels the pitch. Chromatic and automatic its ingenious one handed operation allows it to be attached to most surfaces on most musical instruments. Requires no wires, pickups or microphones and decouples the music from any ambient room noise. It learns and remembers and uses learn mode to adjust the tuning reference and remains in a battery backed recallable preset even when turned off. The high contrast backlit LCD displays each note like a VU meter using simple to follow arrows. Made in the USA.