Recommendations for a baby monitor that doesn’t need WiFi! Like the ones with the video monitors? I bought one with WiFi…

Recommendations for a baby monitor that doesn’t need WiFi! Like the ones with the video monitors? I bought one with WiFi but I guess since the router is in my room it won’t connect when it’s in her room. I have just an old fashioned one for my son lol he’s almost 4 so we just use it to listen because he won’t fall asleep without his door shut