This is an item tracker which we challenged the limit of thinness.
Discussing with PCB designer many times, we could design it almost as thin as a button battery that is inserted inside the case.
The design of chamfered edge gave an impression that looks thinner than an actual object.
The thinner the product, the harder to press the button. We designed its shape into triangle, so that we can push it certainly with just finger tips.
The original thickness was 4.5ｍｍ at first. However, we could thin it to 3.7mm by the effort of mechanical design.
size : W24×D46×H3.7