RJ-1 portable water purifier equipped with a 0.1-micron filter, perfect for travel and outdoor activities. Portable bottle water purifier - Model Name: RJ-1 - Application: Portable water purifier - Filter Size: 0.1 micron - Included: Water bottle, filter - Country of Manufacture: Japan The box was only opened for photography. The contents are unused. The purchase date is unknown. The outer box has some minor stains.