[Specifications 2] ● Type: Fixed-temperature residential disaster prevention alarm ● Model number: Resident Police No. 26-56 ● Power supply: Dedicated lithium battery (included) ● Battery life: about 10 years ● Alarm sound: 70 dB or more at 1 m ●Installation position: Ceiling surface, wall surface ●National test passed product ●Detection method: Thermal type (constant temperature type)