This shows the lifespan of the light source. Beamers need to have their lamps (light source) replaced every now and then.
Audible noise is the noise that a device produces while in operation. Reduced audible noise improves quality.
3.operating power consumption
How much power the device consumes when it's switched on.
4.power consumption in standby mode
The power consumption in standby mode, also called energy-saving mode, measures the amount of power the device consumes when shut down but still plugged in.
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.
We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.