Iron shell 7-mode dual-band upgrade with outdoor antenna Iron shell 7-mode dual-band standard does not have outdoor antenna Tuoshu Blue 6-antenna dual-band version Tuoshu blue 4-antenna single-frequency white 6-antenna AC1200 dual-frequency white 6-antenna AC1200 dual-frequency white 6-antenna AC1200 dual-frequency white 6-antenna AC1200 dual-frequency white 6-antenna