FeaturesSmart security to keep your home and loved ones safeUses Z-Wave wireless tech up to a distance of 152mIncludes 3 security modes for added peace of mindCompatible with Amazon AlexaDIY installation plus battery in case of a power cutThis 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.KeypadPower: AC adapter, rechargeable battery includedBattery life: Up to 8 months per charge 1Dimensions: 14.9 cm. x 12.9 cm. X 7.5 cm. (5.87 in. x 3.94 in. x 0.91 in.)Operating conditions: 0°C to 40°C (32°F to 104°F)Installation: Wall mount with quick-release bracket or place it on any flat surfaceConnectivity: Z-Wave (76 metre range to Base Station)Setup requirements :Ring Alarm Base Station (sold with Alarm Security Kit)Warranty: 2-year limited warrantyContact SensorPower: 3V lithium battery includedBattery life: Approximately three years 1Operating conditions: 0°C to 49°C (32°F to 120°F )Dimensions: 8.2 cm. x 2.5 cm. x 2.4 cm. (3.23 in. x 0.98 in. x 0.94 in.)Connectivity: Z-Wave (76 metre range to Base Station)Installation: Mounts to doors and window framesMaximum distance between sensors: 1.27 cmSetup requirements: Ring Alarm Base Station (sold with Alarm Security Kit)Warranty: 2-year limited warrantyMotion DetectorPower: 3V lithium battery includedBattery life: Approximately three years 1Dimensions: 9.0 cm. x 6.2 cm. x 4.5 cm. (3.54 in. x 2.44 in. x 1.77 in.)Operating conditions: 0°C to 49°C (32°F to 120°F)Connectivity: Z-Wave (76 metre range to Base Station)Installation: Mounts to room corners or flat wallsSetup requirements: Ring Alarm Base Station (sold with Alarm Security Kit)Warranty: 2-year limited warrantyRange ExtenderPower: AC adapter, rechargeable battery includedBattery life: Rechargeable 24-hour battery backup 1Operating conditions: 0°C to 49°C (32°F to 120°F)Dimensions: 8.0 cm. x 4.6 cm. x 2.8 cm. (3.15 in. x 1.81 in. x 1.10 in.)Connectivity: Z-Wave (76 metre range to Base Station)Installation: Plugs into standard UK power socketsSetup requirements: Ring Alarm Base Station (sold with Alarm Security Kit)Actual results may vary based on factors such as usage, location, and the environment.Ring Protect Plus sold separately. For more information on plans and pricing, visit Ring.com/protect-plans.Pet detection: If set at the lowest motion sensitivity setting and mounted at 2.1 metres above ground for pets under 22kg.