About this item: COVERAGE; 105° Scanning Range ensures a large area is covered. It can be used for doorways, sheds, caravans, garages EASY INSTALLATION; Because of the battery operation there are no wires. Just an adjustable wall mount, which is included WIRELESS; Alarm powered by 4 x AA batteries or 6V DC power adapter (not included). The remotes are powered by 3 x AG13 button cell batteries (included) LOUD ALARM; 105dB alarm This Item Included 2pcs Alarm and 4pcs remote Controller, portable remote controls on key chains. These are used to arm/ disarm the alarm and come with batteries included The Motion sensing alarm - shed alarm battery powered - security for garden Sheds and Caravans .