tuning modes to choose from (chromatic, guitar, ukulele, violin, C ukulele, D ukulele). In guitar or bass mode, there is a flat tuning option. For other stringed instruments like mandolin, banjo, please use chromatic mode to tune them. The built-in high-sensitivity piezo sensor ensures extremely precise tuning. The screen can be rotated, which makes reading easier. The default tone is 440 Hz, but you can adjust it from 430 to 450 Hz as needed. Short press mode various instrument mode switch keys C: Twelve equal temperament, G: guitar, B: bass, V: violin, UC: C ukulele, UD: D ukulele A4 value key (only G/B mode can be used) In guitar and bass tuning mode, press the b key to adjust the semitone: b, bb (only G/B mode can be used) Small size is ideal for storage or travel (check photo size), but the note displayed on the screen is large for easy reading, even from a distance. The orange hands on the left indicate a note that is too low, on the right a note that is too high. The green hands in the middle mean the note is in tune. The tuner is made of environmentally friendly ABS plastic and has a fine finish. The thick rubber pad on the clip protects the varnish of your instrument. It will automatically turn off without intervention within 5 minutes to save power. Important Note: This tuner is suitable for most stringed instruments like guitar, bass, ukulele, violin, banjo, mandolin, etc. However, it is not suitable for other instruments like drums, saxophone, clarinet, flute, piano, etc. Size: 27*37*50mm Color:Black Delivery quantity:1 piece