The Atlas Sound M2000-SM is a valuable security product that can be used on any flat surface, including windows, doors, walls, and ducts. The subtle design of the M2000-SM two-part transducer / transformer provides discrete placement and mounting options. Incorporating NXT Exciter Technology in a 1", coil-mounted plate, the transducer offers installation, while the transformer can be remote-mounted and adjusted with variable tap settings. Note: The M2000-SM requires a sound masking generator and 70.7 V amplifier for operation.