Love this faucet, and recommend also buying the power adapter.  This unit comes with batteries, which are great as a backup for power outages.  But when the batteris die, you will not be able to turn on the water.  From other reviews, the batteries seem to last several months, but for peace of mind, just ask Wayfair to recommend the power supply to get and go ahead and buy it.  The Motion Sense is awesome!  Especially in these days of COVID and even more frequent hand washing than usual.  The color looks great in black, with a stainless steel sink... since my appliances are stainless with black details.