Olubfdh Ultrasonic Cleaner 640ml, 49000Hz Ultrasonic Washing Machine with 3 Time Modes, Ultrasonic Cleaning for Jewellery, Glasses, Watches, Rings, Necklaces, Dental/Dental Prostheses, Razors49000Hz High FrequencyUltrasonic cleaner vibrates water 49000 times per second to remove hidden dirt. Using a high performance ultrasonic vibration, ideal for everyday use, protein dirt can be cleaned and this dirt sticks to small parts and crevices that are difficult to treat with water. By generating microvibrations in the water, the sound vibration wave penetrates the precious metal that the brush cannot reach and cleans stubborn dirt. Simple