Set an array object with mongoose making ID to each object in the array

Here is screenshot of document:
In this document there is array of objects, each object include 3 variables: name,zone,deviceType. (You can see mongoose model in the link also)
But somehow, every object get an _id, well, I don’t need it.
I’m getting the array ready from the Front-end, and it’s taking the object ready with variables, and I just do Model.devices = DevicesArraya