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This Defender Hands Free Color Video Intercom System with 7 in. Monitor & Night Vision drops from $179.99 to $139.99 with free shipping at HomeDepot.com. This is the best price we could find on this video intercom system by $30. It can be integrated with an existing doorbell and has a two-way mic, night vision, and is compatible with Door Strike (sold separately) to remotely lock and unlock doors. Sales tax is charged in most states.