Carrying cases, holders, protective cases and stands featuring power supply connectors, adaptors, speakers and battery charging devices, specially adapted for use with handheld digital electronic devices, namely, tablet computers; Digital notepads; Downloadable computer application software for handheld computers, namely, software for use in database management; Hand-held 3D scanners; Handheld computers; Handheld personal computers; Mobile telephones; Notebook computers; Tablet computers