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