Key Features . Smart security to keep your home and loved ones safeCompatible with Amazon AlexaUses Z-Wave wireless tech up to a distance of 152mDIY installation plus battery in case of a power cutIncludes 3 security modes for added peace of mind This Ring Alarm 5-Piece Starter Kit comes with everything you need to make your home and loved ones feel safe. The Ring Base Station brings all your devices together and sends notifications to your mobile via the handy app whenever something happens. You\'ll also get a Ring Contact Sensor which attaches to a door or window and sends alerts whenever they\'re opened while the motion sensor can keep an eye out for any suspicious activity in a room. You can control all this using the included numeric keypad and even set-up voice commands through Amazon Alexa. To top it all off the range extender provides a strong signal throughout your house so you won\'t have to deal with weak connections. Product Specifications . Dimensions (H)16.9 x (W)16.9 x (D)3.6 cmBridge Included YesInstallation DIYManufacturer Warranty 1 Year. .