Microphones are a powerful addition to IP camera surveillance systems adding an audio layer to the information captured by a security system. They can help draw an operator's attention to incidents or add meaning to an otherwise unintelligible scene. In monitored meetings or interrogations a ceiling-mounted microphone adds an essential soundtrack to the video recording.The SCA-M30 is an unobtrusive indoor microphone which is optimised for capturing clear high quality sound. Its high sensitivity is enhanced by physical protection against vibration and a filter to reject unwanted low-frequency noise.Installation is easy with a range of ceiling mounting options. It connects directly to Sony's IP cameras which also supply the microphone's operating power.