The Blink Sync Module 2 is the central hub for all Blink devices, the sync module ensures that each camera operates smoothly under a single IP address
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Blink Add-On Sync Module 2 : : Devices & Accessories
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Does the Blink Sync Module 2 Chime?
Additional Blink Sync Module
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Multiple versions of Sync Module 2 : r/blinkcameras
1PCS Outlet Wall Mount for Blink Sync Module 2 Mount Bracket Holder for Blink Outdoor Camera No Messy Wires Outdoor and Indoor Home Camera Mount with Short Charging Cable
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Blink Sync Module 2