At start, it reads 100% but it's lower than 100% w/o app. It Lowers max volume on system unless you use app to increase. Then you get higher max volume than without app though 600% is at best 300% actual increase. You have to re-increase volume on each and every page or app you use. needs higher start volume or have preset for at least 200%. I under stand why they don't have preset, because if you have a web page that has extremely low volume and you increase to 600% the go to page with high volume and your on 600% there goes your speakers.