Maxell 190059 Thunderon Brush System 8 Language DVD Only Lens Cleaner, with Equipment Set Up and Enhancement Features Designed for DVD players Features Thunderon Brush System Equipment set up and enhancement features (ideal for home theater) Interactive on-screen instructions with 8 languages The 3 small holes contain small "brushes" which create a static charge to which dust is attracted, when spinning inside the drive being cleaned. After the cleaning cycle, when the disc is removed, the static charge dissipates releasing any dust from inside the DVD drive.