Can this be used to detect a tub that has overflowed?

Yes. I believe so. As long as you place it out side the tub wall on the floor where potential water will overflow, it will work. The leak detector 4 sensors at the bottom of the device to alarm you whenever there is a pool of water. Note : There is also a sensor on the top ( two parallel lines) which can detect a drip from the faucet also. Hope that helps.

Can the audible alarm be silenced from the iphone app?

How do we silence the alarm in case we are cleaning water from the spot. Is it single click, double click or something else on the sensor button?

How do i connect to the wi-fi network? how can i connect the water sensor?

Here are the steps to connect the gateway to the Wi-Fi Network: 1. Connect your phone to the 2.4GHz network first. 2. Open Govee Home App, tap the "+" icon in the top right corner of My Device page, and select "H5040." 3. Press and hold the gateway's Wi-Fi Pairing Button for 3 seconds. The indicator light will slowly flash blue when the gateway is ready to connect to Wi-Fi. 4. Follow the on-screen instructions in the app to complete connecting with Wi-Fi. 5. Once successfully connected to Wi-Fi, the indicator will show solid blue and the Water Senser will be shown on the app's device list. The water sensors that come with the gateway are paired by default. 6. Pull out the plastic pull tab from the Water Sensor. 7. Press the sensor's button and there will be a beep one second later, indicating it is properly working. If there is no beep, please open the back cover via a PH00/PH0 screwdriver to replace with new batteries. 8. Adjust the sensor alarm volume by pressing the button twice within 1 second and the indicator light will flash quickly. Repeatedly press the button to cycle through HIGH-MEDIUM-LOW-MUTE volume levels. The default volume level will be high. 9. The sensor will play an alarm if the sensor or sensor surface contacts with water. 10. Press the Mute Button to stop the alarm for 5 seconds. Remove the water from the sensor and wipe it down completely to stop the alarm. Need any help, feel free to contact us via Amazon message center.

How to pair additional water leak detectors to this gateway?

Here are the steps to pair the extra Water Detectors to the gateway: 1. Please press the lower pairing button（on-off button）for 3 seconds until the light on the gateway flash in red and blue alternately. 2. Please press the button on the water-leak detector for one second. 3. The light on the gateway will turn into a quick blue flash when receiving the signal from the sensor. 4. When the light on the gateway stays blue all the time, it means it has been successfully connected. Need any help, feel free to contact us via Amazon message center.

Number of Batteries	4 AAA batteries required. (included)
Voltage	6 Volts (DC)
Control Method	App
Noise Level	100 Decibels
Manufacturer	Govee
Item model number	H5040+H5054
Product Dimensions	13 x 9.3 x 5.59 cm; 259 g
ASIN	B095STF6FG

Govee WiFi Water Sensor 2 Pack, 100dB Adjustable Alarm and App Notifications, Leak and Drip Alerts by Email, Detector for Home, Bedrooms, Basement, Kitchen, Bathroom, Laundry(Not Support 5G WiFi)

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