Starter kit includes an Ooma base station, 4 wireless door and window sensors, 1 motion sensor, 1 water sensor, and 1 Ooma Siren 2 Connects to your smartphone for easy installation, live HD streaming, and real-time notifications Advanced facial recognition technology allows you to see who is coming or going, even when you're not at home Automatically arm and disarm the system whenever you leave or arrive home for effortless peace of mind Control this home security system hands-free with Amazon Alexa Expandable with other Ooma sensors (sold separately) for whole-house protection