Elertus Alerts Elrt10-7 Wireless Remote Water Monitoring System Sends Alerts for Water Leak Detection Remotely monitor water leaks and humidity from your phone, tablet, and computer. Perfect for monitoring your home, second home, business cabin, or rental property. Check status through phone or computer to detect water leaks and monitor room temperature while you are away. Connects to your existing Wi-Fi network. Customizable alerts sent through smartphone notifications, text message, and email. Elertus App for iPhone and Android devices lets you customize alerts on the go. The Water Leak Sensor Accessory alerts you in real-time once water is detected. No subscription required. 2 AA Battery powered. Batteries included.