The Blink Video Doorbell System in Black (Model B08SG2MS3V) provides reliable home security with 1080p HD day and infrared night video. This versatile smart doorbell can be installed wire-free using two AA lithium batteries with up to a two-year battery life, or connected to existing doorbell wiring to sound your in-home chime. It features two-way audio to speak with visitors via the Blink Home Monitor app and motion-activated alerts. This system is compatible with Amazon Alexa for voice-controlled monitoring and requires a Blink Sync Module (sold separately for standalone units, but often bundled in systems) for advanced features like live view on demand

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