The Vanolarm ALERTOLARM Wireless Alarm with PIR Sensor , with a huge wireless range of up to 280m from the PIR sensors to sound receiver, goods and property can be protected from a multiple of locations. Whether its your holiday home, your own home, your car, work-van, shed, workshop, out building, site office or your bike, and youve been unlucky to experience a break in, you know how frustrating and upsetting it is. Its not the damage, its the theft of something youve worked hard for, and the feeling of being violated. ALERTOLARM is an enhanced version of the split PIR motion sensor, using both infrared and motion detections to prevent false alarms raising audible alerts via its sound receiver to, either dissuade the thief from entry or raise instant alerts to the owner. When adding four different PIR sensors units, entry points are easily identifiable by the four different coloured lights on the sound receiver only 1 x PIR sensor per single system box. Choose from a large variety of alert messages for the sound receiver, be they alarm sounds, human voice warning messages of a combinations of the two. Different sounds can be linked to each PIR sensor to further help identify various entry pointsPIR sensors. Audible sound receiver can either by freestanding or screw fixed into location. The PIR sensor comes with high adhesion sticky pads for easy installation or alternatively can be screwed into. Both PIR sensor and Sound receiver can be powered via USB or either standard Alkaline batteries. The Power off memory ensures no need to be constantly re-programming if there is a power failure etc. 4th generation power-saving technology, meaning longer life battery usage 7 months on average, whilst allowing both PIR and Sound receiver to be placed anywhere without the need for mains power. PIR requires 3x AAA Batteries - Not included Sound Receiver requires 2x AA Batteries - Not included