I built this once: https://foundrytechnologies.com/relay.php https://foundrytechnologies.com/relay.php It didn't sell in large volumes but it's fun to see the

I built this once: https://foundrytechnologies.com/relay.php https://foundrytechnologies.com/relay.php It didn't sell in large volumes but it's fun to see the units that did sell checking in every 5 minutes from around the world to this day.