Audio Alarm for MRI Suite

Paper details:

the project is a practicum, not a thesis. the main purpose of this project is improving the magnetic resonance imaging safety. I just need a writer to write my material and method part which should include:
* a full description about the installation of an Audio alarm similar to the one that uses for home security in MRI zone3 door ( I attached the image of the device) and how it works ” for example: How many meters should be above the door and the dimensions of the device to detect any motion…etc”
* the cost of the device
*suggest a protocol for any hospital can follow to install the device ,how many times should change the battery and do the maintenance