One unit is brand new and the other the included battery has been activated (replaceable)

The Lot of 2 Simplisafe Motion Sensor Detector MS3 Security System in White is a reliable and efficient home surveillance system. These motion sensors are compatible with Simplisafe brand systems and are powered by batteries for convenient installation. With an operating range of 9 meters and smart home compatibility with Google Assistant and Amazon Alexa, these sensors provide security and peace of mind. The automatic motion tracking and Wi-Fi connectivity features make it easy to monitor your home remotely. Perfect for indoor use, these sensors offer maximum resolution of 1080p and a voltage of 3V, ensuring clear and accurate surveillance.