The FireAngel Optical smoke alarm is perfect for any room in your home. Protect your home and family by installing this alarm. The optical sensor in this alarm is designed to detect slow smouldering fires and is less prone to nuisance activations, such as cooking mishaps. It's powered by a very common 9v battery which has a suggested lifespan of 1 year. It's recommended that you test your alarms once per year with a replacement suggested after 3 years for optimal performance. These alarms are ideal for the bedroom, living room, landing, hallway and dining room. Features and benefits Twin pack - Cover more of your home with this pack of 2 smoke alarms. Toast proof - The optical sensor in this device will reduce the risk of activation by cooking mishaps but will also more accurately detect a slow smouldering fire. Easy to install and test - This alarm is easy to install and has a dedicated test button to ensure you're protected all year round. Specifications Twin pack Colour: White Toas