9 Chargers for electronic devices; chargers of the kind that are attachable to a power outlet and connect to a mobile device in the form of a mobile phone, a mobile display, or a mobile media player; chargers that expand or enhance the processing power of a mobile device; chargers that expand or enhance the functionality of a mobile device; chargers that expand or enhance the storage of a mobile device; chargers that include a speaker for a mobile device; chargers that include a microphone for a mobile device; chargers that serve as a battery backup for a mobile device; chargers that serve as a battery expansion for a mobile device; chargers that serve as a battery charger for a mobile device; chargers that include sensors for detecting air quality, namely, for detecting components in the form of volatile gases, carbon dioxide, carbon monoxide, pollen or toxins included in air; chargers that include sensors for detecting air quality, namely, for detecting physical characteristics of air in the form of temperature, barometric pressure or humidity of air; chargers that include sensors for detecting air quality, namely, for detecting components of air in the form of oxygen concentration of air or nitrogen concentration of air