Arduino bluetooth (Small hardware project)

I'm wanting to connect multiple hardware devices to my app to send basic data to me,
such as when a light is turned on or off. For the project I'm working on all the hardware should be as
small as possible.

So my question is, how can I send data to my phone from multiple instances of my hardware and what would be the best and smallest hardware I can use for a project like this.

Hope the community can help me out since I'm fairly new to all this!

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If you are asking if you can send data acquired by Arduino from multiple sources to your phone, the answer is a clear yes. The detail of how you do it depends on circumstances that are not yet clear, and it may be nothing more than personal choice. Since you mention bluetooth, yes, that is that is a common way of going about it.