The product functions correctly and as expected. Batteries are required, specifically CR2032. The clamp is stiff and small, making it somewhat difficult to use. It only activates through vibration, so the voice function is unresponsive when the instrument is played. When used for violin, viola, cello, or double bass, it displays only the four open string notes. The CHRO mode is versatile, showing all notes.

The instrument functions and displays something on the violin strings.

That's acceptable.

Shipped quickly, functions properly!