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Power Source: three 1.5V batteries, one 9V battery Quiescent current: 80uA Temperature: -10℃~+40℃ Frequency: 433.92MHZ Alarm decibel: ≥85db/3m test button(RED LED) low voltage single Flash alarm indicator LM-101LB LM-101LC inter-connected(if one detector sounds, others will sound together) Solid connections(2 screws) and battery included