MESMART WiFi Smart Flammable Combustible Gas Leak Sensor Detector Leakage Detection Abnormal Alarm Safety Warning Wireless Smart Home Security System Compatible with Amazon Alexa Echo

The description states "No Hub Required" But neither of the two devices will link to the MESMART app. I am using the 2.4 Ghz wifi and no mac ID security on the router. No useful installation instructions. No website with help. Help in the app is useless and in broken english.