The HeyWater sensor works on hard or soft surfaces, on floors and carpets. Easy to install, simply power it with two AA Alkaline batteries and place it on the floor of the room to be protected. Ideal for basements, kitchens, bathrooms. When the water creates conduction between the two detection probes, HeyWater will activate the internal buzzer and send notification to the Hey Smart App. Note: this is only a water detector. will provide timely warning, can not stop the flow of water. Tips for positioning: list of ideal locations to position the HeyWater sensor includes places with washing machines, water heater, dishwasher, toilet, sink, humidifier, ice maker.