What stands out about this product is the Features field says N/A, removing any guesswork about extras.
11 Pin Square Relay Socket, PC Mount, .187″ Blade New Old Stock – RDI 721-0014
You will find that Phoenix Contact relays are widely available, so getting replacements does not turn into a long wait.
The timer is a nice touch for those who want a bit of automation without complexity.
The Switch Harness Set is bundled, and that means fewer extra parts to source on your own.