Technical characteristics:
The volume: ≥ 80dB
Power supply: DV9V
Battery life: Carbon- zinc batteries ---about 1 year
Alkaline batteries--- about 3 years
Operating temperature: -10 ℃ - +50 ℃
Relative humidity: ≤ 95% RH (40 ℃ ± 2 ℃)
Output form: sound alarming
Execution standard: GB4715-2005
Weight:about 135g (include battery)
