This is no small thing; the standard for Wi-Fi was developed on unlicensed spectrum that had been considered "junk band", cluttered with low-intensity signals from microwave ovens and baby monitors.

The city has a special resonance for U2 as the band relocated to what was then East Berlin in 1990 to record the Achtung Baby album, on the eve of German reunification.

If this band is cut, removed or tampered with, alarms will sound to alert staff and the unit will go into lockdown status to ensure the safety of the baby.