Chromatic Tuner with Keychain!
The new Keyring Tuner Rocktile is the perfect tuner on the go. Barely the size of a car key it is best suited for your pocket and even a key chain. Thus, the Rocktile Keyring Tuner is always right at hand when you need a tuner quickly.
The sound recognition is via a built-in microphone. Simply hold the sound source in the vicinity of the tuner and it shows you immediately if your instrument is in tune (green backlight) or if it is too high or too low (red backlight). To conserve battery, the tuner automatically switches off 3 minutes after the last use.