Ultrasonic Retainer Cleaner features include 1. 44000 Hz high-frequency ultrasonic technology provides 360 deep cleaning. 2. Visible top cover design, 2 U-V lights will turn on automatically when the cover is closed during use. 3. 250ml portable capacity. 4. Made of SUS304 stainless steel for durability. 5. Two cleaning modes to choose from: Touch ..