One of the world's smallest pendulum Metronomes. The taktell Super-Mini metronome runs long and reliably and marks the time visually as well as audibly, and just as accurately as the larger Wittner Metronomes. No batteries required - The metronome uses a wind up key, which can be in the built-in storage space when the metronome is not in use. Made with the Wittner quality, This is one of the world's smallest pendulums, spring wound metronome. Small enough to be carried in a coat pocket or hand bag yet very accurate. Perfect for people who like pendulum metronome with portability.