Remote Control Outlet, TESSAN Wireless Electrical Plug Switch for Lights, Lamps, Fans, 100ft RF Range, 1200W (1 Remote + 1 Outlet)

https://a.co/d/0gHTr6Md Wireless lamp remote. You won’t even need the lamp. When they push the button, the unit clicks as it electrifies the lamp. I had one of those for my Receptionist to tell me the client is ready and the click was enough. Your problem is absolutely going to be people forgetting to push the button.