Fully functional GRBLDuino Mega Relay PCB with an outdated relay footprint. The relays are available through SparkFun but are not consistent with other Eccentric Workshop products and therefore obsolete (plus they are an unknown brand).
Some have unlabeled transistor pins and others have no orientation marked on the diodes.
No warranty, no returns, no support, no backorders (backorders will be treated as a donation - thank you!). Sold as is.