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JRC, made of of
a K band Doppler sensor module.
Form NJR4251J B1219
A frequency 24.125 GHz ± 5 MHz?
The output electric power 7mW (typ)
A power supply, DC5V 50mA
The 2nd picture has been taken apart and the inner substrate has been just seen. (The one taken apart is the same model, but a frequency is different from a lot, so it may not be same at all).
Oscillation is using dielectric resonator, so even a small size seems able to expect the stability of some level.
A lid stops at 6 horns of special screw (TP7).
The detailed specification is a page of a manufacturer.
Please see O.
When a label is peeled off like the 3rd picture, there is a frequency trimming screw, so when a frequency is a little when turning 6 corners of this screw by a wrench, it's possible to adjust it.
It's dielectric resonator, so when a screw can become high-frequency at a forced way and loosen, they become short.
How about for from bureaus of for experiments of 24GHz or a higher harmonic blender of 47GHz receiver?