Miniaturized pumps and valves that rely on the motion of dielectric elastomeric silicone films are being created in Saarland, ...

The motion of dielectric elastomeric silicone films is what makes these devices lightweight, compact, and able to utilize low energy.

But as mentioned, some people have been lucky enough to get more than a free month of Prime, so it's a good idea for customers to push back a bit and explain why the delay is such an inconvenience.