Waterless operation will damage your equipment. Jewelry products, metal discoloration and rust problems cannot be removed completely.If the surface is soft gems, scratches or cracks, it is not suitable for ultrasonic cleaners.Only watches with a waterproof depth of over 200 meters can be cleaned with an ultrasonic cleaner.Please add neutral cleaning solution, do not use strong acid or strong alkaline cleaning solutions. Please check the ingredients chart for cleaning liquids before use.If you use the machine several times continuously, the machine will enter the self-protection system and can be resumed after about 5 minutes to prevent the parts from being damaged or broken due to overheating.Be careful not to let water permeate the power connection, and do not wash the whole product directly.Wash back and tank water from the side of the desk and wipe the inside of the tank with a cloth.