Features: It has a built in PIR motion sensor that will activate the alarm if any movement is detected. It is simple to fit, there are no wires to connect, just put the required batteries in(requires 4 AA not supplied). Alternatively you can use a 6v adapter which you can also use which is not supplied with this unit, fix to a suitable surface And turn it on using one of the supplied remote controls. Ideal for protecting your property against unwelcome intruders. It can be situated to cover the front door, back door, garage, shed, outbuildings etc. It is also suitable for use on caravans and motor homes. Specifications: Powered: 4x AA batteries (not included) Loud: 105 Db alarm Material: plastic Size: 12*88*50mm Type:Wireless magnetic Alarm Color: white Package included: 1 x Alarm sensor 2 x Remote control 1 x Mount bracket