1.has top energy efficiency rating
The appliance is either Energy Star Certified, or has an EU energy efficiency rating of A++ or A+++. This means it consumes around 20-30% less energy than is required by the minimum local standards for energy efficiency.
We consider a thinner chassis better because it makes the product more compact and portable. Thinness is a feature highlighted by many manufacturers of mobile devices, but it is essential for a wide range of products.
3.annual power consumption
The more power per year a device consumes, the less energy efficient it is, making it more costly over time.
The height represents the vertical dimension of the product. We consider a smaller height better because it assures easy maneuverability.
The width represents the horizontal dimension of the product. We consider a smaller width better because it assures easy maneuverability.
6.Has an interior light switch
The interior light switch can reduce costs by switching it off as you might find it unnecessary in the middle of the day.