The Efficiency tracker is part of a wireless vacuum cleaner. This system makes vacuum cleaning more fun and will encourage people to start vacuuming. Also, the user will be able to vacuum faster and more efficiently. As a result, vacuuming will be easier and less of an occupation. 

The Efficiency tracker indicates whether you need to vacuum faster or slower using the icons. Because the system keeps track of distance and time, it will give you an efficiency score at the end. This allows the user to see if the vacuuming has been done correctly.