Sensaphone FGD-0057 External Microphone

External Microphone for Sensaphone Provides listen-in and/or high sound alarm capability at a remote location away from your Sensaphone. Comes with 25 feet of wire. External Microphone for Sensaphone Units Specifications Works with the FGD1400, FGD1800. Simply connect the Microphone to one of the inputs on your Sensaphone alarm unit. Comes with 25 feet of wire. External Microphone for Sensaphone Units Includes 1 - External Microphone for Sensaphone Units 25' wire