Simple random sampling VS Convenience sampling

Simple random sampling :
1) Sample is selected from a wide population, and randomly selected from any area.
2) the extent of generalizability is wide.
3) the sample selected may not be available on time.

Convenience sampling :
1) Sample is selected from a nearby population.so, there is a possibility of bias selection.
2) It is applicable only to the group selected.
3) sample is biasely selected with the purpose that they are available on time.