LINKASE PRO - 3G + WiFi Signal Enhancing Case for iPhone 5S/ iPhone 5 for AT&T, Verizon, Sprint (Frost White) Compatible for iPhone 5S and iPhone 5, for AT&T, Verizon, and Sprint Enhance 3G Connection in Low Signal Area (1-2bars) Enhance Wi-Fi Connection in your usual deal spots 20% Extra Battery Life - 40 minutes extra talk time Made with Shock-Resistent Polycarbonate and Multi-Layer Coating for scratch proof