Will outdoor motion sensor + bridge send alert to phone?

If I purchase a pair of outdoor motions sensors (plus bridge), and either one detects motion, will it give me some sort of alert on my phone? Do I need lights? Basically I want the outdoor sensors to alert me of motion. Is there anyway to achieve this? I know cameras can do this but I don't want cameras. I also don't have paid plan and don't want one for now. I have ring camera, doorbell, and an alarm system with indoor sensors. All Ring brand. Any tips/tricks are appreciated.