Distance measuring apparatus; Flashing safety lights; Luminous traffic signals; Pedometers; Power supplies; Protective helmets for sports; Renewable battery system to provide backup power; Smartwatches; Speed indicators; Speedometer testers; Speedometers; Speedometers for vehicles; Theft alarms; Wearable activity trackers; Apparatus for recording distance; Bicycle speedometers; Burglar alarms; Downloadable communication software to access data stored on an oximeter and transfer data to anothe...