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    Replace battery in Visonic Siren MCS-710 and MCS-720

    Hi, Hoping for some help. I have a Visonic PowerMax Complete and now I need to replace the batteries in two Sirens MCS-710 and MCS-720. I have the installer code to the system but I am not sure in which order to replace the batteries. In the MCS-710 instruction it says that I login to the...
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