Water Leak Detection With Multi-Alert System: Notifications Sent To Your Phone, Plus Optional Google Assistant Voice Alerts Built-In 100 Db Siren And Led Strobe For Prompt Alerts Monitor Two Locations Out Of The Box: Includes One Plug-In Master Unit (With 1.5 Ft Detection Cable) And One Battery-Powered Sensor Expandable Whole-Home Monitoring: Expands To Supports Up To 17 Sensors Total (One Master + 16 Battery-Powered Pods) No Hub Required, Easy Setup: Connects To Your Existing Wi-Fi No Hubs, Plumber Or Geeky Know-How Required. Reliable Wi-Fi + Sub-Ghz Connectivity: Sub-Ghz Wireless Link Provides Extended Coverage Over 300 Ft. Indoors Or 1000 Ft. In Open Space. Easy App Management: Simple Plug-And-Play Setup With The Free Aquila Pro Ai App. Trusted D-Link Quality & Support: 1-Year D-Link Warranty Trusted Brand With 39+ Years Of Experience Not Compatible With Previous D-Link Water Sensors (Dch-161-Us, Dch-S1621Kt, Dch-S163).