FireAngle Thermoptek Smoke Alarm with improved detection of slow-smouldering fires. It’s handy “sleep-easy” function allows the smoke alarm to be temporarily silenced for 8 hours. Thermoptek multi-sensor technology as used by over 90% of the UK fire and rescue services. Smart Silence – allows the alarm to be silenced for up to 10 minutes in the event of a known false alarm. During these 10 minutes if additional smoke is detected the alarm will sound. Sleep easy allows a low battery chirp to be silenced for 8 hours, this function can be used up to 10 times.