1.Wireless smoke detector 2.Smoke alarm 3.Voltage:DC9V 4.Distance:100-200m 5.Frequency: 315, ... , and easy installation ,It can alarm independently , It also can match with security main panel as a detector to alarm, With low power indication. Tech Spec ... :100- 200 meters Alert concentration :0.65-1 .55% FT Alarm volume: 85dB in 10 feet Dimensions: 107 × 38mm (flame-retardant ...