Service?We offer the best value and service. . Free returns if you have any dissatisfaction. We will reply your E-mail within 12 hours and compensate you. We promise that any product problems can be resolved. Installation?Easy to install on any clean and smooth glass by tearing off the backing paper, leaving no marks when removed. Note: Front adhesive design and stick inside the window. Anti-theft Alarm?Visible warning bad behaviors, potential criminal or thefts.High contrast colours catch attention.Ward off would-be thieves and prevent pesky behaviors of drivers and passengers. Material? Waterproof Vinyl Sticker, Static Sticker, No Glue Required, Waterproof, Scratch Resistant.Will last almost indefinitely; Will not roll off when rolling the window down. Package? 4 PCS, Size 2x 4 inches, and copyrighted design, Clear words, easy to read and very striking.