Another cost saving measure was the light transmission portion of the top cover, similar units utilized a clear light pipe to transmit status lights from the PCB to the top of the unit, which is effective but adds tool and assembly costs as well as a visual impact. For Listen a more simple solution using a circular boss and thin section molded into the top cover was used. When the unit was off the top cover kept its sleek uninterrupted look, but when turned on the LED would shine through the thin portion of plastic letting the user know the device is functioning, the circular boss created a crisp light location so no unwanted “light spill” was seen.
The battery is accessible by removing the top cover, to maintain the sleek appearance and simple user experience button snaps were created in the lower half of the enclosure that could be disengaged for battery replacement. Finite Element Analysis was performed to ensure that the buttons would provide the desired feel & holding force.