The DeltaLab CT-40 is a chromatic tuner designed for use with most stringed instruments including 7-string guitar and bass guitars as well as keyboards and wind instruments. The compact design allows easy transport in a pocket or gig bag. Large LCD screen with needle type meter and bright indicator LEDs make the CT-40 easy to read. A built in metal kick-stand makes the CT-40 easier to use on a table top. Includes two AAA batteries.