The Ei146e mains powered optical smoke alarm from EI Electronics is the upgrade to the Ei146RC detector. The new model features a sleek new design, sealed insect mesh, and automatic dust compensation for improved resistance to false alarms. Full backward compatibility with all devices used with the previous versions, including the Ei1529RC remote control switch and Ei168RC wireless base, means adding it to an existing EI140/160/3000 system or replacing an old alarm is quick, easy, and reliable. Power: 230V mains powered with back-up battery Backup Battery: 9V alkaline battery (included) Warranty: 5 year warranty Supplied with Easi-Fit base for quick installation by your electrician Alarm head can be used to replace an old Ei146 or Ei146RC model without replacing the base All the new technology is in the detector head Keep your new base as a spare Interlink up to 12 units in a single system via 3 core cable Part of the new E Series also featuring the Ei144e heat alarm Kitemarked to BS