Ring popularized app-first security, from devices that work with its Neighbors app<\/a> to simple DIY sensors that bring the neighborhood watch into the digital age<\/a>. For homes with legacy wired zones, Ring\u2019s answer was the Ring Alarm Retrofit Kit\u2014a bridge that reuses existing door\/window wiring with Ring Alarm. As of 2025, Ring confirms the Retrofit Kit is no longer sold new but remains supported for existing owners (Ring Help Center<\/a>). Scope remains targeted: it brings wired contacts (and in many cases simple PIR loops) into Ring Alarm, but it doesn\u2019t take over life\u2011safety devices or legacy keypads\/sirens, and Ring Alarm devices do not support Matter (product page<\/a>; Ring on Matter<\/a>). Recent user feedback trends are mixed\u2011to\u2011positive when expectations match the scope\u2014most reported issues stem from EOL resistor handling, zone mapping, and attempts to reuse powered sensors without separate power (Ring Retrofit Kit help section<\/a>; Ring Community<\/a>; Reddit r\/Ring<\/a>).<\/p>\n\n\n\n Availability and pricing have shifted to the secondary market. Ring does not list the Retrofit Kit on its current Alarm accessories page, and there are no in\u2011stock first\u2011party listings (Ring Alarm accessories<\/a>). Amazon search results typically surface legacy marketplace entries rather than an active Ring listing (Amazon search<\/a>). Recent resale data show completed eBay sales commonly in the mid\u2011$100s to low\u2011$300s depending on condition and completeness; prices can exceed the historical ~$199 street price due to scarcity (eBay Sold listings<\/a>). Ring\u2019s Help Center notes the product is not sold new and provides support information for current owners; no end\u2011of\u2011support date is published there (Ring Help Center<\/a>).<\/p>\n\n\n