USB Relay Controller

Hi,

I found these cheap USB Relay Controllers on eBay: http://www.ebay.com/bhp/usb-relay-controller
Can we use it on an Asus router (Merlin firmware)?
They say it uses HID technology (no driver needed I guess), but I have no idea how to control them from the router.

I think it would be great if an experienced developer can take a look. Maybe this link helps too: http://vusb.wikidot.com/project:driver-less-usb-relays-hid-interface

Imagine the possibilities!

Thank you!