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Monitor...The monitor is battery operated using 4 x C batteries (not included). No installation is required, as the system is wireless. Up to 30 call buttons, door or movement sensors can be easily programmed into the system. The range is approximately 150 metres and indicates the calls by audio and visual displays. There is a choice of 3 volume adjustable alarm sounds, plus the voice alert. The display will also indicate low battery and signal strength.