Key Features . Alexa compatible.Compatible with Android and iOS operating systems.App needed for use Ring App.Operates over wi-fi.Requires wireless router for use.Suitable for outdoor. Enhance your Ring Alarm Security System and let the neighbourhood know you have whole-home security covered. If there\'s an emergency Outdoor Siren can help others quickly identify your home with an adjustable volume siren and flashing LED lights. Connect an additional compatible power source and turn on the Dusk to Dawn feature to use Ring Alarm Outdoor Siren as an everyday security sign.Add Outdoor Siren outside your home to alert others if an emergency arises at your home..