... ,Operate with audio alert; products introductionWireless intellegent auto-dial or phone line security alarm system:1. This product can choose many kinds ... alarm, fire alarm, gas leak, magnetic contact alarm, hall alarm, window alarm, balcony alarm, and perimeter alarm11. Timing defense and withdrawal ... ~ +55C10. Relative Humidity: 40% ~ 80% ireless intellegent phone security alarm system