Not Many reviews on KZfaq about stand-alone wifi smoke detectors. I paid about $15 for this one.
Positives: App, connectivity, size, and instructions
Negatives: Slow to respond to smoke compared to regular smoke detectors.
VERDICT: Great price and better than nothing for away from home alerts. I would recommend using this alongside your regular cheap smoke detectors.
Yuya Wifi Smoke Detector
www.aliexpress.com/item/40005...