Sweden - Operator's Breastplate Transmitter, World War II - Military equipment

This object is a Microphone Assembly Type 1, also known as an "Operator's Breastplate Transmitter".
It is a specific type of headset and microphone that was used during World War II by operators, particularly the WAAF (Women's Auxiliary Air Force) plotters in the operations rooms during the Battle of Britain.
Features and Usage
Design: The device consists of a metal chest plate that was secured around the operator's neck and torso with canvas straps.
Functionality: The microphone is mounted on an adjustable arm, allowing the operator to keep her hands free for other tasks, such as moving markings on a plotting table.
Specifications: It is registered under the part number 10a/14278.
Materials: The set is made from materials such as nickel-plated brass, Bakelite for the mouthpiece, and a green-painted metal plate.
The original cord is still neatly attached.
I bought this years ago at an auction in Aberdeen (Scotland).
Original color on the band shows some wear spots from its extensive use in the war years, a beautiful piece of engineering.
This piece of war history lay stored for years on
DM Beith (North Ayrshire, Scotland) This enormous site had actually been adapted for use as a storage area for heavy munitions, and especially when the US came with a large amount of ammunition for NATO, it had to make space for museum materials, and over the years it was auctioned off. I bought this lot consisting of a plate with a communication horn and the accompanying headset from the communications centre in London.
For the collector, a rare piece of war history.