cell phone, cell phones, cellphone, cellphones, cellular, cellular phone, cellular phones, cellulars, child, children, color, color image, colored, colors, colour, colours, communicate, communicated, communicates, communicating, communication, communications, day, daylight, daytime, destination, destinations, discovering, exploration, explorations, exploring, familial, families, family, free time, getaway, girl, girls, headphones, holiday, holidayed, holidaying, holidays, human, human being, humans, in-ear headphones, inside, internet, internets, journey, journeyed, journeying, journeys, juvenile, juveniles, kid, kids, kin, kinfolk, kinfolks, leisure, leisure time, lifestyle, lifestyles, mass transit, mass transportation, minor, minors, mobile, mobile phone, mobile phones, mobiles, passenger, passengers, people, person, phone, phones, photographic, photography, pre adolescent child, public transit, public transport, public transportation, public transportations, relatives, seated, sibling, siblings, sightseeing, sister, sisterly, sisters, sit, sits, sitting, smart phone, sustainability, sustainable development, sustainable lifestyle, sustainable lifestyles, sustainable resources, technical, technological, technologies, technology, teen, teenage, teenage boy, teenage boys, teenager, teenagers, teens, telephone, three quarter length, three-quarter length, together, togetherness, tour, toured, touring, tourism, tours, train, train - vehicle, trains, transit, transport, transportation, transporting, transports, travel, travel destinations, traveler, traveling, travelled, travelling, travels, trip, trips, two, two people, twos, using phone, vacation, vacationing, vacations, vehicle, vehicle interior, vehicle interiors, vehicles, vertical, vertically, verticals, visiting, wireless, wireless technology, young, youngster, youngsters, youth, youthful, youthfulness, youths, europe, gothenburg, scandinavia, sweden, wireless headphones, wireless in-ear headphones