DU Speed Booster is an Android optimizer & cleaner master with a FREE built-in antivirus security feature. It can boost the speed of your phone by up to 60%, cleans junk (cache) files from your system, and increases the available storage space on your SD card. It is a total Android phone optimization solution that combines the advanced functionality of an apps task cleaner, speed and ram booster, storage (junk & cache) analyzer, security antivirus guard and protection master for your phone.