https://techcrunch.com/2017/08/31/first-impressions-of-essentials-360-degree-camera-attachment/

Essential has a unique port around back on its debut Phone, which can handle data and power transfer, and which attaches to accessories via magnets. The first such accessory is Essential’s own 360 camera, which offers you an easy way to capture immersive images and video in a very small package. The Essential 360 camera is much smaller than most other consumer 360 cameras out there, and aims to be something that’s as easy to take with wherever you go as the phone itself.

I got a chance to take the 360 camera for a spin over the past few days, now that it’s preparing to ship out to early Essential customers. The diminutive camera easily slides into a pocket or bag, and snaps into place on the back of the Essential phone with a satisfying click. The magnetic force also feels strong enough that you can be confident the camera won’t fall off during use, while also keeping the accessory easy enough to remove when you want to.