Read more UBH1 Easy to install and easy to test and silence. The reliable UBH1 will alert you to a fire in your kitchen and will give you extra time to escape safely. Alarm (H x Dia: 40 x 102mm) Baseplate Screws 2x AA Batteries Manual Heat Alarm with Replaceable Battery The UBH1s high performance temperature sensor detects fires without being sensitive to false alarms from cooking or toasting. The alarm is ideal for kitchens and other smoke/fume filled rooms. The outstanding quality and reliability has been certified and kitemarked to BS 5446-2:2003.