Lightly used Tempi Mechanical Metronome is a versatile and durable metronome suitable for various musical instruments such as guitar, piano, cello, violin, ukulele, banjo, viola, and drums. With its analog and mechanical features, this metronome allows for precise and accurate timing for your practice sessions. The Tempi Mechanical Metronome is compact in size, measuring 8.66 inches in height and 4.13 inches in width, making it easy to handle and store. Weighing 500 grams, this metronome is lightweight and portable, perfect for musicians on the go. Does njt need batteries just wind it up