The FireAngel Optical Smoke Alarm (FA6615-R-T2) in a Twin Pack is a reliable and essential home security device. These smoke detectors are powered by batteries and come in a sleek white colour, fitting seamlessly into any home decor. With the FireAngel brand known for quality and performance, these alarms offer peace of mind knowing your home is protected against potential fires. The ST-625 Replacement ensures that you have a backup option in case of any issues with your current alarms.