YoSmart DS77-U02W User Manual page 6

Add a leak sensor
Follow the on-screen instructions to add your leaksensor to the hub. screen instructions to add your leaksensor to the hub.
Press and hold the Set Button for about 5 secondstill the status LED is green blinking. Press and hold the Set Button for about 5 secondstill the status LED is green blinking.
Test Alerts
Place your leak sensor onto a wet sponge no more than1cm deep. Place your leak sensor onto a wet sponge no more than1cm deep.
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2017 KingTing Tech. Corporation
Door Sensor and Leak Sensor Leak Sensor