This product looks nice, built-in power supply and speakers, sound can adjust the size according to their needs. Built-in dial-up, no phone to automatically dial 6 groups of phone alarm, remote targeting and monitoring live recording, cut lines can prevent alarm, there is an external cable and alarm devices, as well as placing the battery device to prevent power outages, you can configure multiple probes and other monitoring facilities, urban residents and luxury villas that housekeeping is a good helper cheap price package that pretty much the number of products