This metronome is great. Instructions with this item are clear and if you need extra help there are diagrams to show you where different parts are and what’s what. The metronome is simple to use and requires no batteries. It’s about 20cm high, All you do is wind it up and set the tempo and you’re good to go.. The tempo is easily adjusted by changing the weight on the metronome hand. There are labels on the metronome to show you where different tempos are. Def recommend this metronome due to its high quality and easiness to use. This is great for a variety of instruments