Nvidia Jetson Nano 4GB Cluster. Micro-SD Compatible. 5x barrel jack power chords included with 5x J-pin connectors. We've included one Ice Tower for the Masternode. Larger Cooling Tower is also included with LED Lights. The Larger Cooling Tower has had a fan bracket repaired. The electrical chords must be properly placed for proper fan and LED light operation. A digital manual is online with the schematics based on the model #. Ensure fans are not rubbing or cluttered with dust for a clean operation. Not included, are the Ethernet chords and a Splitter, sitting between the model and the Jetsons for synchronicity. All Jetsons operate fine. Use Jetpack 4.* for the OS, or a Linux kernel. Public in-person meet-up only.