The SEC 09 is Designed for security/surveillance applications the SEC 09 hidden Omni-Directional Condenser Microphone is housed in a lookalike durable ABS ceiling mounted fire detector in White. Typical pickup range is up to 50ft (15 Metres) The circuitry contains a rotary switch that offers 5 different preset sensitivities to suit the environment and ambient noise location. Circuitry also contains inbuilt line level preamplifier and 9 – 48 Volt Phantom Power switchable for 12 – 24 Volt dc operation. Red Led status led indicator, universal mounting to electrical conduit boxes.