This powerful cleaning machine has a mild impact. The 42,000 Hz ultrasonic energy wave generates millions of tiny cleaning bubbles, which can gently remove dirt and grime without the use of harsh chemicals or scrubbing. The movement of the water may seem gentle, but it actually produces a deep and thorough cleaning to penetrate the most difficult areas. You won't believe that your items can shine with just water! Just fill the water tank with water, insert your items, and you will see a professional jewelry cleaning effect. You can add a little hand soap/dishwasher to enhance cleaning, but all the work is done by ultrasound. This powerful device can be cleaned in minutes without damaging delicate items. Therefore, whether it is dirty daily necessities or priceless treasures, the KECOOLKE Digital Ultrasonic Jewelry Cleaner can safely rejuvenate them.