This is a dry cleaner for Blu-ray recorders. Used 3-4 times. The following is the official description: OHM OHM OA-MMLC-BR1 [Multi-Lens Cleaner for Blu-ray Recorders] Compatible with cleaning lenses of conventional DVDs as well as more sensitive Blu-ray recorders! A new cleaning system enables safer lens cleaning! Since the base disc is a DVD, it is not compatible with CD-only players/Blu-ray-only players that cannot play DVDs. Includes a 5.1ch speaker system check function! Number of uses: Approximately 50 times (depending on the degree of lens dirt)