ON AIR LIGHT LED Sign by OKEDEN,Room Decor Wall Decor Light Sign Recording Sign for Vloggers, Youtube Stars, Home Studio, or Just Cool,Easy ON/OFF Switch and Operates on AA Batteries or USB Power

I got my wife one of these 2 years ago. It has saved us from many arguments. She turns it on when she is on a call so I know to stay clear and not to make noise. https://www.amazon.com/dp/B0B198GG4Y?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1