Coverage:105 scanning range ensures coverage of large areas. Can be used at doorways, sheds, caravans, garages Easy to install no wires are required as it is battery powered. Just an adjustable wall mount Wireless the siren is powered by 4 AA batteries (not included). The remote control is powered by 3 AG13 button batteries (included)Loud alarm: 105dB alarm Remote control the siren comes with 2 small portable remote controls with keychain. These are used to arm or disarm the alarm and come with batteries Motion Sensor Alarm - Shed Alarm Battery Powered - Garden Shed and Caravan Security Use this motion sensor siren to alert any intruders. Place the siren anywhere you need, on the wall with an adjustable bracket, or place it on a shelf or table. (Not fully weatherproof)The siren comes with 2 small portable remote controls with keychain. These are used to arm or disarm the alarm and come with batteries Included 1 x Motion Sensor Siren 2 x Keyring Remote Controls