For better transmission.
The flexibility of the external antenna and the extension cable provided, allows you to position it in the best possible receiving point.  This optional will be of great help to overcome eventual obstacles of radio transmission between transmitting units and receiving units, guaranteeing maximum range and the best communication during any kind conditions during use.

A safety signal.
For your personal safety IMET proposes a robust and efficient flashing signal light that can be connected directly to the relay, purposely present inside all of our receiving units.