The casing was lined with a 1mm thick white translucent nylon rubber gasket.

Within the red translucent polycarbonate shell, there were two colourless transparent holes. These may be for the light sensors on the PCB to detect ambient light, a feature used to assist with sleep tracking.

The rubber gasket can be pulled out with tweezers. This gasket would help with water resistance.

Inside the device was a single unit that included a battery and the PCB. This could be pried out using a spudger.