The sensor should connect in less than five seconds after the button press. If the website does not indicate that it is active, please press the button again. If it still does not work, try moving closer to an electrical cord or outlet and press the button again. You will see a quick green flash on the sensor to indicate that the button was pressed. After the sensor has been activated and synced with the Hub, place the sensor in the desired location, but make sure that it remains near an electrical outlet or a wall with internal wiring.