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The security relay is a simple accessory which prevents doors from being opened with a 12V battery. Such a battery allows burglars to open low-power locks if they reach the cables connecting the intercom/reader to the lock. Install the relay between the intercom/reader and the lock. Then pair the security relay with the 2N device. Once set up, the lock will only open if the relay identifies the specific signal sent from the intercom/reader.
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