The Moen AC Adapter Kit allows you to connect your faucet directly to a power outlet. The AC adapter in this kit can be used instead of the battery pack included with the MotionSense, MotionSense Wave, and U by Moen series kitchen faucets. The Moen AC Adapter Kit also includes a Power Splitter unit that allows you to connect both the AC adapter and battery pack to the faucet. If the power goes out and AC power is unavailable, then the U by Moen or MotionSense faucet will use the battery pack as a backup power source. The Power Splitter has LED indicators that let you know whether AC or battery power is currently being used, if the batteries need to be replaced, or if there is a problem with the connection.