I accidentally purchased this and realized my mistake after opening the box. It is unused. Expiration date: April 2028. This is a set of two 120ml bottles of O2 One, which is a powerful cleaning solution for hard contact lenses. - Brand: ROHTO - Model Name: O2 One - Contents: 120ml x 2 bottles - Purpose: Cleaning and storing hard contact lenses - Manufacturer: Rohto Pharmaceutical Co., Ltd. Thank you for looking.