The GP-U999SJVLCAA from Samsung is a Water Leak Sensor which enables you to receive alerts when moisture is detected in your space. In addition, you'll be able to set connected devices to power on and off when a water leak is detected. The SmartThings app for iOS and Android enables monitoring and control of your connected devices.
This water leak sensor utilizes the Zigbee protocol and has a 130' operating range. It is powered by an included CR2 battery. A SmartThings hub, SmartThings Wi-Fi, or compatible devices with SmartThings hub functionality (available separately) is required for operation.