Planet Waves S.O.S Guitar Tuner Details;

The revolutionary Planet Waves S.O.S. Guitar Tuner pulses two out-of-phase LED light beams directly onto the vibrating string. When the string is out of tune, the two lights will visually dance on the string being tuned. As you approach in-tune status, the movement slows down and eventually stops when you are perfectly in tune. This revolutionary visual tuning system enables precision tuning in silent or noisy environments, with the need for audible sound or sensing of any kind.
• Ergonomic pick-sized design
• Light Based Tuning
• Precisely tune in dark or noisy environments