JOYO pulsating metro-tuner with patented vibrate function pick up your instrument's string frequency based on the vibration made when you pluck the string. Our tuners are highly accurate, weather-resistant and easy to operate. Features chromatic, guitar, bass, violin and ukulele tuning. Mic, clip tuning modes. It has 5-60 minutes vibrate time and 3 types vibrate modes. Measures 60 mm length by 110 mm height by 24 mm width.