Protective cases and covers for mobile electronic devices, namely, smartphones, tablet computers; protective cases and covers adapted to accommodate external accessories for use with mobile electronic devices, namely, smartphones, tablet computers; accessories specially adapted for use with protective cases and covers for smartphones, tablet computers, namely, batteries and power management systems comprised of a power switch and power indicator, wallet features, camera systems comprised of lenses, carrying apparatus, tripod, extension pole camera support, audio systems comprised of speakers, audio boost and microphone, mounting devices, mobile payment systems comprised of a chip reader, magstripe reader and electronic storage systems comprised of a flash drive