Advanced ultrasonic cleaning technology Ultrasonic cleaning is the use of ultrasonic cavitation in liquid, make the dirt layer by dispersion, emulsification, dissection and cleaning. There are two cleaning modes: 2 minutes Fast Cleaning Time and 5 minutes Strong Cleaning, both of them can clean your lenses effectively. DONGSEN Ultrasonic Contact Lens Cleaner CE-3500 Ultrasonic Cleaning Technique / Built-in Battery Power Supply / Perfectly Portable / Built-in Vanity Mirror Stylish appearance Makeup mirror model, round and elegant & Compact shape convenient to carry A deep cleaning, much faster 2 Minutes Rapid Ultrasonic Cleaning 5 Minutes Strong Ultrasonic Cleaning Best contact lens cleaning box for travel Within built-in battery and charge with USB cable, Socket is unnecessary, use a combination of power bank 1 Year Warranty All products provide a one-year guarantee quality after-sales service. Specifications: Model No.: CE-3500 Tank material：SUS316 Stainless steel Single tank capacity: 2ml Power supply: DC 5V Power: 3W Fast cleaning: 2 mins (once a day) Strong cleaning: 5 mins (once a week) Ultrasonic frequency: 58 KHz Built-in battery: 1800mA Dimensions and Weight: Product weight: 135g Product size (L x W x H): 98×86×45（mm） Package Size (L x W x H): 206 x120 x 70 mm Package Contents: 1 x Ultrasonic Contact Lens Cleaner 1 x USB cable 1 x operating manual