(1) Lowest back-repair rate (2) Safe (3) 3L,4L,5L,6L,10L,22L,33L and big ultrasonic cleaner equipment OEM. (4) 1 year warranty, 5-10 years useful time. (5) 220V-240VAC and 110V-120VAC are both no problem. (6) Different countries have different kind of plug. (7) I could translate the current user guide into Local lanuage. (8) good serivce. What is Ultrasonic cleaner: An ultrasonic cleaner, often colloquially referred to as a sonicator, is a cleaning device that uses ultrasound (usually from 20–400 KHZ) and an appropriate cleaning solution to clean delicate items. The ultrasound is not effective without the cleaning solution; it enhances the effect of a solution appropriate for the item to be cleaned and the soiling. They are often employed for cleaning of jewellery, lenses and other optical parts, coins, watches, dental and surgical instruments, fountain pens, industrial parts and electronic equipment. In everyday use such devices may be found in use in most jewelry workshops, watchmakers establishments, or in electronic repair workshops (where it could be used for cleaning an electronic device that has been exposed to particles which hinder its operation). Process characteristics: Ultrasonic cleaning uses high frequency sound waves to agitate in an aqueous or organic compound. Cavitation bubbles induced by the agitation act on contaminants adhering to substrates like metals, plastics, glass, rubber, and ceramics. This action also penetrates blind holes, cracks, and recesses. The intention is to thoroughly remove tightly adhering or embedded particles from solid surfaces. Water or other solvents can be used, depending on the type of contamination and the workpiece. Contaminants can include dust, dirt, oil, pigments, grease, polishing compounds, flux agents, fingerprints, soot wax and mold release agents, biological soil like blood, and so on. Ultrasonic cleaning can be used for a wide range of workpiece shapes, sizes and materials, and may not require the part to be disassembled prior to cleaning. Cleaning solution: Ultrasonic activity (cavitation) helps the solution to do its job; plain water would not normally be effective. The cleaning solution contains ingredients designed to make ultrasonic cleaning more effective. For example, reduction of surface tension increases cavitation levels, so the solution contains a good wetting agent (surfactant). Aqueous cleaning solutions contain detergents, wetting agents and other components, and have a large influence on the cleaning process. Correct composition of the solution is very dependent upon the item cleaned. Solutions are mostly used warm, at about 50—65 °C (149 °F), however, in medical applications it is generally accepted that cleaning should be at temperatures below 38C to prevent protein coagulation. Water-based solutions are more limited in their ability to remove contaminants by chemical action alone than solvent solutions; e.g. for delicate parts covered with thick grease. The effort required to design an effective aqueous-cleaning system for a particular purpose is much greater than for a solvent system.