Mouse Glaser (works on glass) A4Tech

The innovative dual focus lens on glaser is designed to not only work on both normal and shining surfaces, but also on the transparent glasses. Dual focus technology has combined the present laser and optical engine and provides the best tracking performance to date. Furthermore, the light from glaser mouse is proven to be harmless to eyes. Also this A4-Tech laser mouse has a double click button so to open a document you only have to click once instead of twice.