The RD250 Roadie Bass is an automatic string tuner that is easy to use, extremely accurate and can fine-tune your guitar in seconds. Roadie Bass is compatible with almost all stringed instruments with guitar-like machine heads. It is fully standalone and uses vibration detection to tune even in the noisiest environments. Roadie Bass adds new dimensions to music-making by allowing you to freely experiment with known alternate tunings as well as save custom alternate tunings.