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Power Supply
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| Power Supply:
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| · | External Voltage: 5 VDC +/- 10%
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| · | Batteries:
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| · | Main Power: Built-in rechargeable Lithium-ion battery for system power
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| · | Backup Power: Rechargeable Lithium-ion battery for memory & RTC backup
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| · | Working voltage:
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| · | Normal Mode: 80-90 mA
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| · | Power Saving Mode: 30 mA
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| · | Working period (assuming full battery):
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| · | Continue Mode: 9 hours
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| · | Power Saving Mode: 16 hours
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