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I picked the doorbell, document camera, and organizer for laptops. The doorbell would provide security in letting the teacher know someone is at the door when it is locked. The document camera for projecting papers or instruction so all students can see from anywhere in the room. Organizer for the laptops is maintaining calmness for how students put their laptops up and in the right slot.

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A doorbell for classrooms in a school would allow teachers to keep their doors locked at all times which they should. However, it will let them know when a student or another adult is at the door and needs to be let in.

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Walmart

Amazon

Lowe's

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There are a bunch of amazon that range from $10-$40. These one amazon differ in size and color.
The ones from Walmart are close to $13.
The one from Lowe's ranges from $16-$30.

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These are not compatible with any device because they would have a button on the outside of the classroom next to the door. Then the speaker for the doorbell would be located somewhere in the classroom in a outlet.

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The doorbell will need to have some rules like only pressing the button to ring once and not a billion times. Not trying to play or take it off from where it was located. Not hiding the button anywhere. Other than setting some rules with your students and letting them know how to use it, there is no other training required.

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This will impact all the students in that classroom and the teacher plus other students and staff who will need to come into the room. It will impact the whole school.

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The administration, I would tell them that as we should keep our doors locked all the time because of safety reasons. If we have our doors unlocked for the kids to be able to easily go in and out, it puts the room as risk for unwanted guest to pop in. If we have our doorbell, then we will know there is someone at the door needing in and it is most likely a student or another staff member.

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I would introduce to my students the little change we are going to make to the classroom. Introducing how to use it, how not to use it, the rules, and the reason behind using it.