3 Volts
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YoLink Smart Home Starter Kit: Water Sensor 4-Pack & Hub Kit – Sensor Compatible with Alexa and IFTTT, 1/4 Mile Range…
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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..)$79.99