UniFi Protect Smart Sensor is a versatile, battery-operated multi-sensor that detects motion and environmental conditions. It includes a motion sensor with a maximum range of 5 meters (16 feet), a magnetic entry sensor for door or window open/close detection, an accelerometer for garage door open/close monitoring, a temperature sensor, a humidity sensor, an ambient light sensor, and an alarm sound sensor for detecting specific alarm patterns. Additionally, it has a water sensor for detecting leaks and floods (requires a water sensor adapter accessory). The sensor communicates and sends alerts to the UniFi Protect ecosystem over Bluetooth, and it can be connected to a UniFi Access Point for extended range in indoor settings. It provides a recommended range of 15 meters (49 feet) with performance varying based on the environment.