YoLink Smart Home Starter Kit: Amazon's Choice Water Sensor 4-Pack

In our opinion, these are a must have.  Water leaks seldom occur at a convenient time so we can spot them immediately.  Often it's in the middle of the night, or while you are away.   These detectors will make sure you know about leaks as soon as possible.

Brand: YoLink

Color: White

Features:

• Easy to install. Scan, Plug and Play. Full installation and setup in less than 10 minutes
• Protected and informed, with Realtime phone app notifications, emails, SMS messages and automations (turn on optional sirens, smart plugs..)
• FAIL/SAFE: Patented technology! Pair your leak sensors to battery powered valve controllers and/or sirens. No internet, no WiFi, power outage no worries!
• Latest Wireless Technology LoRa: low-power consumption (5+ year battery life) and "Longest Range, by Far!" (1/4 mile, open air)
• Whole house smart home solution: Your YoLink leak detection system is part of a complete product line, including smart wireless automatic water shut-off and a full smart home solution, including security, locks, plugs & switches, temperature, humidity, and smoke/CO sensors, and more
• Requirements – Android or Apple smartphone, wired ethernet port or WiFi connection. App is always free, with 5 free texts per device, plus 5, per month.

model number: YS1603-UC+YS7903-UC*4

Part Number: YS1603-UC+YS7903-UC*4

Details: 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

Package Dimensions: 7.7 x 4.8 x 2.7 inches