The R240P Smoke Alarm offers robust safety features with its 240V mains power supply and 9V battery backup for one year. It features a 140mm slide base for straightforward installation and supports both hardwired and RF module interconnection for flexible setup. Additionally, it includes a dual mesh insect guard to assist in the prevention of false alarms caused by insects. This provides enhanced protection and peace of mind. RF Module not included and can be purchased separately. This product must be installed by a licensed electrician.