Your Onelink Environment Monitor requires AC power and battery backup. You must activate the battery backup by unscrewing the cap off the device and pulling on the plastic tab. You will have two (2) minutes to activate both sources of power upon on-boarding. If the device times out after two (2) minutes without both AC power and battery activation, the light ring will glow blue and it will chirp. Reset the device by pushing the test/silence button three (3) times, then make sure both sources of power are activated and begin the pairing process with the app.