Cherub's WST-660V Tuner is a high-quality clip-on for your instrument with chromatic and violin tuning modes. An easy-to-use design with only one button and a bright LCD display that you can see whether on stage or in the studio. Padding inside of the clip and an anti-skid design prevent scratching to your instrument. The auto power-off function will turn off if there is no signal present or operation in 5 minutes.