My apologies for any confusion with the term "wireless"!
In this day and age of wireless (bluetooth, WiFi, etc.) technology, we often forget the original transition from wired telegraph to wireless telegraph.
Many aircraft of the interwar period, as well as WWII and shortly agter, which had the room and a dedicated radio operator, had a key for tapping out Morse Code on certain low frequencies, which could carry further and with clarity over the higher frequencies used for voice communications.
And those are great close-up photos of the T.1 key. I also see the dial for the loop antenna (below the key) used for direction finding - the loop antenna on the Bf110 was on the bottom of the fuselage, just aft of the cockpit.
This was the same antenna and directional TX/RX equipment that was used on the Bv138, Fw200, He177, Bv222, etc...