360 Security - Antivirus Boost - This app is very versatile, it not only speeds up your system, optimizing it, but also will protect it from unwanted apps or ad units. The developers assure us that with this application you can not worry about the security of your device, because this app will protect it from all the Trojans and vulnerabilities. But they took care not only about the protection and health of your device, optimizing this app so that it almost does not consume your battery.
If you can't choose which antivirus is right for you, read our article "Choosing the best antivirus for Android"