Unknown device got in my network

Hi all, the last two days an unknown device “Sercomm” has connected to my network and I don’t have any items like like IP cams or window or door sensors. I looked this up and it’s a home management system, which I don’t have! All it show is MAC address and host name. I have two ring cams/doorbell which I can identify. A couple amazon plugs (identified) and an echo (identified). I paused the Sercomm device and it came back (with different numbers after Sercomm) the next day even after I changed my password and all my devices. Any ideas?