Clear and eye-catchingThe font is printed clearly, with red background on one side and other is green background. The difference between two colors makes it very conspicuous in the place. Magnetic and adhesive sticker selective useTwo installation choices for you, you can directly put it on any magnetic surfaces or use the attached tape to paste on the non-magnetic surfaces, which is easy to install and labor-saving without tools needed. Portable and durableThis product is made of durable aluminum and inner is made of quality acrylic, light cover, portable, waterproof, not as fragile as plastic. Quick changesThis sign is sliding door sign, one sign can show two states. Only put it in a horizontal position, the slider can slide easily to display open or closed smoothly and quickly. Multiple useSuitable for using in any shop door/office door/meeting room/home office /dorm room which want others do not disturb indoors working. Also fit for using in outdoor exhibition/recording room/public service buildings. By sliding the slider display can OPEN or CLOSED, simple and clear know the state of the room.