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Hi - The baby units of the VTech RM5764-2HD does not have a battery back up mode. They have to be plugged in to AC power at all times to function. Thank you, -VTech Support
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Hi - The baby units of the VTech RM5764-2HD does not have a battery back up mode. They have to be plugged in to AC power at all times to function. Thank you, -VTech Support