This Aico EI144E Heat Alarm in white is an essential addition to your home security system. With a battery backup feature, this hardwired alarm is designed to protect you and your loved ones in case of a fire. The item diameter is 15 cm, and it weighs 325 g, making it easy to install and use. The Aico EI144E Heat Alarm is an excellent choice for those looking for a reliable and efficient smoke detector. It has a range of features, including a battery backup, and is designed to work with a single battery. This model is perfect for anyone who wants peace of mind knowing that their home is protected in case of an emergency.