The Ring Alarm V2 700 Series 8-Piece Kit is perfect for homeowners looking to secure their 1-2 bedroom homes. With easy DIY installation, you can quickly set up this customizable security system. • Base Station: 6.65 X 6.65 X 1.46 in, 100 - 240V 50/60Hz AC Adapter Included • Keypad: 4.13 X 4.41 X 0.75 in, AC Adapter and Internal rechargeable Lithium Ion battery included • Contact Sensors (x4): 1.56 X 2.09 X 0.55 inches, 2 CR2032 Coin cell batteries • Motion Detector: 2.6 X 2.6 X 1.53 inches, 2 AA batteries • Range Extender: 1.86 X 3.19 X 1.66 in * including plug in pin height, 100-120V 60Hz The system features a 104-decibel siren and 24-hour backup battery, ensuring you're protected at all times. Receive real-time alerts in the Ring App when your alarm is triggered with a Ring Protect Pro subscription (sold separately). Optional 24/7 emergency support with Alarm Professional Monitoring is also available. Compatible with any iOS and Android device.