LoudMouth Monitor, Audio Alarm Yes, Battery Backup Yes, Voltage 9 V, Width 3, Height 1 in, Requires 9 Volt Battery, Material Plastic, For Use With HeatWeave, UnderFloor, WarmWire, SlabHeat, Includes Alarm, Green Light To Indicate Operation, Include On/Off Switch, Red Light To Indicate Damage To Heating Elements, Test Button To Verify Operation, Alarm Duration Continuous, Alarm Output Through Device