Ultrasonic Cleaners from James Products function by producing sound waves that are transmitted into the tank and cleaning solution. These waves create millions of microscopic bubbles, which collapse or implode, releasing large amounts of energy which scrub the surface clean. This process is called Cavitation. Digital Timer with 5 settings. Despite the compact size, the Ultra 7000S has a large 750ml tank. The basket will carry many small items, saving time and keeping them secure. CD/DVDs can also be cleaned using the holder. Another useful addition is the watch/earring stand that allows your valuables to be securely placed while cleaning. Full CE and RoHS approval. For use with all jewellery.