The worlds smallest photoelectric smoke alarms and thermal heat alarms combine state of the art electronics and superior product design. The Home Starter Pack has been designed to cover the primary areas of your home. The pack contains 2 x Photoelectric Smoke Alarms and 1 x Thermal Heat Alarm for your kitchen or garage. Each is powered by a Duracell lithium battery that lasts for ten years. Install smoke alarms either recessed (19mm profile) or flush (44mm profile) to suit your home.