Ultrasonic Washer Mini Portable USB Rechargeable Contact Lens Cleaner Contact Lens Cleaner uses ultrasonic waves with a frequency of over 56 kHz, with strong transmission power and excellent directivity. It can effectively wipe the lens smudges in a short time and thoroughly clean without damaging the lens.Small and cute and easy to carry, you can put your cosmetic bag, backpack, handbag, pocket etc.