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What are the three zones on the DSC WS4965?

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The first zone can either be the built-in reed switch or the built-in tilt switch. The device then has 2 auxiliary zone inputs that make up zones 2 and 3. These can be just about any hardwired switch, just keep in mind that it cannot provide any power if needed by the hardwired device. Each zone will have its own unique serial number.