EverExceed YC-BF20 consumer ip camera ensures high reliability performance for both indoor and outdoor security. It offers the simplest protection against thieves or intruders to make your home, office or property safe. The built-in batteries are to provide backup power if there is no electricity. It's easy to monitor remotely to check what is happening in your home or secured area. The PIR sensor sends you instant notifcation to make you alert for your safety.