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Alarm Type: Burglar Alarms / Wireless kit. Uses advanced 868MHz technology. Solar powered siren uses daylight to maintain charge. Fully expandable system. Self-learning set up of accessories. Easy to install. Expandable up to 24 devices. Specifications: Up to 125m open field range. Expandable up to 12 PIRs and 6 magnetic door contacts plus up to 6 remote keypads.