Apparatus for measuring the speed of golf swing; Audio dubbing apparatus; 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, cell phones; Digital video cameras; Golf club swing aids, namely, golf club balancing scales and scale parts thereof, to analyze, fit and/or make golf clubs; GPS tracking devices; Rangefinders for golf; Smart g...