You can be assured of the suitability, design and quality of Edis products which now exceed more than 70,000 installs in classrooms in the UK alone. Be sure that you buy the real thing - all our audio products have the Edis product code on the back with the CE mark as Edis products are safety tested as well as performance tested with ongoing inspection and improvements by our UK qualified electronics engineers. Even in these desparate times I guess there is no need to remind you of the dangers of installing unproven pirated copies of our designs!