Getting started with the Meraki MT-15 sensor - here is an unboxing gallery with some notes:

https://flic.kr/s/aHBqjB88w3

Everything you need to POE power the sensor is in the box, just connect an ethernet cable.  Optionally you can use a  USB-C adapter Meraki part# MA-PWR-USB-xx (xx is your country code) for power and wireless connectivity.    Meraki made it fast and easy with a "captured" torx bolt - no more lost or misplaced tiny torx mounting bolts.   You can even configure the intensity of the status LED and also select the metric that reflects the glow ring.  Who doesn't like the eco-friendly all paper packing?