QR link is an app that uses the QR code included with Logitec routers to easily configure the Wi-Fi settings between those routers that support the app and smartphones or tablets. Since you don't need to enter any bothersome encryption keys, anyone can easily connect their smartphone or tablet to Wi-Fi (wireless LAN). Operating environment. Android OS 2. 1/2. 2/2. 3/3. 0/3.