STOP KNOCKING AND NO MORE GUESSING --- Make sure your vistors and customers know you're open for business or currently closed clearly with this useful door signs HIGHLY VISIBLE WITH EXACT ANSWER --- Big bold capital letters in red or green background, easily visible with our 7" slider sign (2" high). A top sliding plate to reveal one message at a time. MAGNETIC AND ADHESIVE STICKER OPTION --- NEVER FALL OFF! With upgraded soft magnet from 0.8mm to 1.5mm. The LATEST UPGRADED magnet securely remains in place on any magnetic surfaces. Foam adhesive backing is included with your order for easy and permanent installation. No residue left when removed STURDY ACRYLIC SHEET --- Sturdy ACRYLIC sheet with fashion appearance.This door sign is more durable than the other signs which is made of leather or paper. And it is good value for money PERFECT FOR BUSSINESS DOORS AND WINDOWS --- This door sign will be useful and suitable when your work time is flexibility. According to simple slip that you can show the operating status of your office room