The device is designed for installation in DIN rail-equipped power cabinets, where it occupies the width of three modules. The HLM-FM module is controlled by four input signals connected to terminals at the bottom of the device. At the top of the device there are terminals for output signals (right and left channels), a power terminal and a terminal for connecting the required external antenna. Examples of input and output terminal connections are given in the technical documentation, see the Downloads section.
Two LEDs indicate the status of the device and the operation in progress. The diode labeled “RAB” informs about the current status of the module (power supply connection, scanning function in progress, etc.), the diode labeled “ST” tells about stereo reception resp. mono signal.