YoLink Smart Home Starter Kit: Amazon's Choice Water Sensor 4-Pack & Hub Kit - Our Best-Selling Original Water Leak Sensor (Qty. 4) and Hub Kit. Sensor Compatible with Alexa and IFTTT
Brand: YoLink
Color: 4 Leak Sensors with Hub
Product Requirements:
The smartphone or tablet able to run iOS 9 or higher; Android 4.4 or higher.

Specifications:
YoLink Hub
Input: 5V DC
Maximum Current: 1A
Working Temperature: -20°C~50°C (-4°F~104°F)
Humidity: 0~90% non-condensing

YoLink Water Leak Sensor
Product Model: YS7903-UC
Voltage: 3V DC (2* AAA battery)
Working Temperature: 0°C~50°C (32°F~122°F)
Working Humidity: ≤100%RH (non-condensing)

Package Content:
1 x YoLink Hub
4 x YoLink Smart Water Leak Sensor
World's Longest Wireless Range: Powered by LoRa technology, the long-range yet low-power system offers the industry’s longest receiving range in the market (1/4 mile). Our long-range coverage enables its use in areas challenging for most residential Wi-Fi systems, such as basements, outdoor porch/patio areas, sheds, free-standing garages, even remote outbuildings on your property.
Easy and Effective Property Protection: The YoLink wireless Water Sensor could not be easier to install; just place near or under the equipment you wish to monitor. Suggested uses are near or under sump pumps, toilets, water heaters, laundry machines, dishwashers, sinks, fish tanks and any other location subject to water leaks and flooding.
Early-Warning Notifications: Receive real-time early-warning notifications (in the form of smartphone banner alerts, limited SMS/text messages, and emails) and protect your home and property from water damage; Due to the water-tight and submersible design of the original Water Leak Sensor, an internal sounder/siren would not be heard outside of the water-tight housing. For an audible alarm, consider our Siren Alarm or consider the Water Leak Sensor 2 which has a built-in sounder.
Plug, Plug & Play! Plug Hub into an outlet, plug Hub into your router, scan in new devices, and enjoy your new system, in minutes! Your Hub is the only device that connects to the Internet, and a wired or WiFi connection is required (wired required for easy & fast Plug, Plug & Play, and most reliable and secure connection). WiFi connection set-up difficulty varies and requires changing settings to your network and/or your phone Changes to your network, passcodes, etc, require changes in the app.
From Simple to Super-Smart: After setting up your notification preferences, keep it simple and let the YoLink system do the rest and monitor your home and property for you. Or, utilize available advanced automation features, including 3rd-party integration with Alexa and IFTTT, to interact with other YoLink and 3rd-party smart devices. Limited only by your imagination!