Lock system app and 3rd party with App Lock advance feature. Pattern and PIN for lock in portrait and landscape screen mode. Protect uninstalled and installed. Hidden icon of App Lock. Themes (Eggs, Love, Circle, Emoticon). Change locker background, set your favorite photo in your gallery or simple color. Time PIN for more secure (Ex: If your password is 12 and the time is 08:15, your PIN will be 120815). Samsung fingerprint for unlock. Dial to open App Lock. Widget icon for open App Lock. Widget icon for switch on/off lock service. Prevent uninstall App Lock with devices admin. Smart Locker screen orientation. Delay lock time for best user experience. DYI your Lock screen. Animation in/out. Change your hint message. Show app name. More secure with: random password key, pattern size, invisible pattern. Start this app lock immediately when your phone start/restart/boot. Plug-in "Intruder Selfie", capture or selfie any intruder trying to access App Locker Master. Working well in Android Lollipop and Android M above. Interface easy to use, easy to lock any apps.