SwitchBot WiFi Water Sensor requires no hub (2.4G only), Smart Water Sensor 3 pack with 100dB Adjustable Alarm & App Notification, IP67 waterproof, Water Leak Detector for kitchen, bathroom, basement.

"Real-time notifications (no hub required): Connected to Wi-Fi, the water sensor sends real-time notifications to you via email and app as soon as it detects water drops, a water leak, or a flood without the need to purchase an additional hub. Share the devices with your family so they can also check on the status of your home at any time. (2.4GHz Wi-fi & BLE only) Highly sensitive drip alarm: Equipped with four sensor probes on the top and bottom, the water sensor can detect low water levels of just 0.5mm. If water pipes drip and the floor is flooded or wet, an alarm will be triggered. The water leak detector has a compact and practical design and can be installed in laundry rooms, tankless water heaters, dishwashers, sinks, and other locations. With loud alarm sounds: To ensure you can hear the alarm loudly and clearly in emergency situations, we have built in a 100 dB loud alarm. Once you reach the emergency site, the alarm can be easily turned off to calmly address the issue. IP67 Waterproof, up to 18 months battery life: The water sensor is equipped with a fully sealed, waterproof casing and can be easily used in high humidity environments. It comes with 2 x AAA batteries and has a battery life of up to 18 months. If the battery level is low, the app will prompt you to replace the batteries. Part of the SwitchBot ecosystem, voice control: Use the SwitchBot Pan/Tilt Cam to remotely turn off electrical devices and check the status of your home in the event of water damage. Also compatible with third-party providers like Google/Alexa/Siri/IFTTT/SmartThings."