Audio- and video-receivers; Baby monitors; Camcorders; Cell phones; DVD players; Electronic book readers; Gesture recognition software; GPS tracking devices; Loudspeakers; Mobile phones; Pedometers; Portable media players; Portable telephones; Portable vibration speakers; Rechargeable batteries; Renewable battery system to provide backup power; Smart rings; Smartwatches; Tablet computers; Television cameras; TV monitors; Video cameras; Video recorders; Virtual reality glasses; Virtual reality...