Your SPC Ebon are designed to be stored in the charging case when you are not using them. In this way, they will be automatically charged and you will be able to enjoy them for a longer time, in addition to transporting them safely and comfortably.
The right one is the so-called master earphone. This earphone has the microphone that is used in hands-free mode and for the voice assistant. However, the hands-free mode will be heard through both headphones.