The Hispec RF10-PRO 10 Year Lithium Sealed Battery Smoke Alarm features an optical smoke sensor suitable for living rooms, bedrooms, hallways and landings. The sensor has been specially designed to protect against contamination to ensure accurate activation in case of an emergency - protecting you from false alarms activating. During installation, the smoke detector is automatically activated by twisting and clicking it into the mounting bracket. The radio-frequency interlinking allows up to 20 smoke and heat alarms of the RF10-PRO Range to be included in one cohesive system. If one alarm activates in another part of the property, it would activate the rest of the system to alert you and your family/friends if occupied in different rooms. The combined test and hush button allows for easy weekly alarm testing and silencing of any nuisance alarms. The Hispec RF10-PRO Range Smoke and Heat Alarms are compliant with Scottish 2022 and Northern Ireland Landlord 2024 legislation. Please note: Smoke and Heat Alarms are sold individually. Combination kits of 2 x smoke + 1 x heat alarms and also 3 x smoke + 1 heat alarms are available. The RF10-PRO series of alarms can also wirelessly interlink with the Hispec RF10-PRO Control Unit and Carbon Monoxide Alarm. Free delivery and same day dispatch on orders placed before 3pm.