We offer a free download utility to lock on and off your Mac - SJ Screen Saver. This is not ordinary screen saver, which many in the Internet. This utility is used to protect your computer while you are away and emergency stop it if necessary. Lock screen - a function that allows you to protect yourself from unwanted viewing of your files. Turn off the computer - a function that allows you to turn off the Mac in an emergency. Monitoring suspicious activity - Detection of unwanted attention to your Mac. All settings to turn off and lock occurs in 3 clicks. Enjoy your use! We would be very grateful if you share this program with all who know!