NOTE: The device only supports Alexa voice control for switching on and off. Alexa is currently unable to provide any information on temperature and humidity. The app sets the alarm range for temperature and humidity in advance. It can be used indoors and outdoors, for the elderly, babies, for pet and animal care & beekeeping, for beer, wine & spirits, for plant, seed and bulb farming, and even in any plant or farm. It will bring you unparalleled intelligence and convenience. Bring more intelligence, more health. Siren with temperature and humidity sensor. Advanced power-off memory function, in the sudden switch-off state, the siren saves the parameters that were set in the app before the siren resumes normal working status in time when switched on, quick recovery. Power supply: MINI-USB OR BATTERY. It can be powered with the normal adapter of any phone via a mini USB line.