... .Stainless steel , durable 2.Singlechip controlled 3.Power-off protection... Glass ultrasonic cleaning machine 1,Mini Ultrasonic cleaner ... countdown display, the default working time (180 seconds).3, use of microcomputer control, human design, time accumulated ... , such as various glasses (including contact lenses), magnifying glass, binoculars, microscopes, cameras, video cameras and other parts ...