Unfortunately, the Zeo uses a silver-coated fabric headband sensor that the company says needs to be replaced every few months to ensure optimal performance. These replacement sensor pads are expensive (about $50 for a three pack). Worse, it seems like the company that made the Zeo went out of business last March, so replacement sensor pads are not available at all now!
You can buy a Zeo on eBay, but in order to keep it running indefinitely, you will need to be able to make your own replacement sensor pads. The design of the sensor pad seemed fairly straightforward. After a bit of research and experimentation, I succeeded in making my own replacement headband sensors, and I'll show you how to make DOZENS of replacement sensors pads that will keep your Zeo going strong forever!
DISCLAIMER: Although I have tested these sensors on my own Zeo device, you assume all risks for damage to your Zeo device by making and using these replacement sensors. I am NOT affiliated with Zeo Inc. in any way and did not consult with them in making this sensor.
I make no guarantees about the performance of these handmade sensors vs the Zeo OEM sensors, but until Zeo Inc begins selling them again, I hope this guide will help people who already have a Zeo device and wish to continue using it.