The FireAngel SI-610, an extremely popular ionisation smoke alarm, was discontinued by the manufacturer in 2018. This replacement alarm from FireAngel has been designed to simply twist onto your existing base plate with no need to drill any more holes in your ceiling or redecorate. The alarm is powered by a 10 year sealed battery and has a 5 year manufacturer's warranty. Suitable for BS 5839-6: 2019 Grade F1 domestic installations and features a Sleep Easy™ function which can silence low battery warnings for up to 8 hours and a large, central test / hush button for easy weekly testing. It is the ideal solution to replace your old SI-610 with no need to change the base plate or redecorate.