That's a really cheap price, but I would assume those are not dry contacts, since they labelled it L (Load) and N (Neutral).
I recently bought one of the new Xiaomi dual Zigbee relays. It's not dry contacts either, but I added two 120v relays to it and put it all in a project box. I'm using it to arm and disarm my alarm system by closing the contacts on one of its fobs. The system otherwise has no control outside of IFTTT or their app. This works great for the purpose.
See this thread for info on the relay and this for what I bought to do the job.
