First Alert BRK ADK-12 Smoke Alarm Adapter Plug for Kidde Hardwire Smoke Alarms, Pack of 12 The First Alert BRK ADK-12 Smoke Alarm Adapter Plug 12pk easily connects tp competitive Kidde, Fyrnetics and Lifesaver alarms without rewiring. This product is compatible with BRK and Kidde Smoke Alarms and saves time and installation costs when retrofitting existing homes or apartments. Compatible First Alert BRK alarms: SC9120B, 4120-series, 9120-series, 7010-series, 5919, 2002RAC, SC6120B, HD6135FB, RM3. Compatible Kidde, Fyrnetics and Lifesaver alarms: 1235-series, 1275-series, 1285-series, 1276 (PE120E), PE120, PI2000 and HD135F. Maximum of 18 units total may be connected (12 Smoke Alarms, plus 6 other devices. ) First Alert designs and creates safety products that preserve and protect the things that are the most important to you, from your children and family to your home and the priceless memories stored inside. Features Easily connect First alert BRK smoke and combination alarms to competitive alarms without rewiring Compatible for hardwire replacement of Kidde, Fyrnetics and Lifesaver models Ideal for retrofit applications See full list of compatible models below Pack of 12 Faster turnarounds on job sites with the easy to install, most trusted alarms in home safety Convenient adapter plug saves time and installation costs when retrofitting existing homes or apartments. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.