Pendulum clocks have had a long tradition because in the past the pendulum was the main regulator of a gear of a clock and by using the pendulum its owners were able to better synchronize time. Pendulum is more an aesthetic decoration today, which traditionally accessorizes the clock in the interior. Except some mechanic models where pendulum has still the function of time regulation, the majority of these JVD is powered by battery gadgets, which, in some selected models, can be equipped with playing modulus. It is possible to set one or more melodies on this modulus, eventually a bell. We recommend using alkaline battery JVD Alkaline Max.