abstract background cell charge communication connection electrical electricity graphic lightning nerve power relay signal surge transfer arrow blank brown consumed direction isolated old sign wood wooden architecture building city construction Mexico Mexico City pavement periferico signs angles appearance communicating communications communications-equipment connecting distant distinctive electrical-signals electromagnetic equipment exterior external height high light mobile-phones modern radio-waves receivers receiving sending Signals slender steel steel-structure tall technical technology telecommunications telephones telephony tower towering transmission transmissions transmitters transmitting air blue fishing flag politics red red flag revolution sky wind digital energy galaxy orbit satelite sattelite space system television tv antenna bus car drive military minibus police siren transport travel vehicle electric electrician hazard protection risk security dish dth modulation network radio receiver wireless Clarity color darkness green lamp lightful orange street traffic yellow