What is that tiny device on the left of the destination display board on the cabin front of Vande Bharat? On the right of the display board is the flasher, as usual. But what is that on the left of it? The same apparatus can be found on the Kashmir RCF EMUs also. Can somebody explain what it is?

Please refer to the images linked below:
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Vande Bharat Image Link 1: click here

2) Vande Bharat Image Link 2:
click here

3) Kashmir RCF EMU Image Link 1: click here

4) Kashmir RCF EMU Image Link 2:
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As we came to know, under a competition by the railway board, every shed needs to design a prototype of toilet fitted locos. Based on that, India's first toilet fitted WAP-7 rolled out from Kanpur electric loco shed around March this year. I have a couple of questions with regard to the said loco, which I'm listing below. Requesting viewers to go through the questions and shed some light on them, please.

1) Does the loco have only a urinal or a full-on toilet?
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What is that tiny thing in front of the flasher, just above the windshield?
3) What is that small round device to the right of the flasher?
4) What is that big pair of tower-like devices on the roof on each door? The same can be seen on the rear end also.

Please refer to the image (courtesy: Saurabh, aka trainwalebhaiya, from Twitter) for my questions. Question points are marked with the respective question numbers in the image.

It'd be really helpful if you can clarify the points raised in the questions.