A very smart tool: CCT-20 is a rotating chromatic tuner you can attach to your instrument's headstock via clip in an easy and quick way. It's back-lightened led screen allows perfect visibility on stage, and you can tune your instrument even if it is unplugged. 6 working modes: chromatic, guitar, bass, violin, ukelele C/D. Ultra compact, ultra reliable, visually captivating. Always in tune with CCT-20!