Is there something different about the controller here than the controller + Bulldog listing? Bought separately with 7 sensors is $20 less currently.

Check if it powered by batteries and adapture or just batteries

Will this work on a 2" Pipe?

If you purchase the correct size one.

Does it come with the electrical plug in option?

The yolink receiver that connects directly to the valve motor does plug into an ac outlet. It can also work off regular alkaline batteries. I use it plugged in, with the batteries working as backup in case power outtage. As the leak sensors can pair directly to the receiver, it should work even if power and internet connection are lost. - hope that helps

How do i make valve shut off work without wifi working? leak sensor does not trigger automation if the hub is offline even though it's all local comms

The sensor signals the valve controller if it gets wet. Wifi helps with notifications and remote operation.

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💧 Stay dry, stay smart—leak protection that works even when the power doesn’t!

SMART ALERTS YOUR WAY - Stay ahead with customizable SMS, app, email, and critical iOS notifications—30 free SMS alerts included monthly.
EFFORTLESS DIY INSTALLATION - No plumbing cuts needed—EVO Valve Operator snaps on easily for instant water leak protection.
FAIL SAFE AUTO VALVE SHUT OFF - Direct device-to-device communication ensures instant valve closure even during power or internet outages.
UNMATCHED LONG RANGE COVERAGE - LoRa wireless tech keeps sensors connected up to 1/4 mile away—protect every corner of your home or office.
SEAMLESS SMART HOME INTEGRATION - Works flawlessly with Alexa, Google Assistant, IFTTT, and Home Assistant for voice control and automation.

The YoLink DIY Automatic Water Leak Detection & Shut-Off Starter Kit combines advanced LoRa wireless technology with a smart valve controller and three leak sensors to provide comprehensive, long-range water leak protection. Featuring device-to-device communication for fail-safe automatic valve shut-off during power or network failures, this easy-to-install system integrates seamlessly with popular smart home platforms and offers customizable alerts with up to 5 years of sensor battery life.