The guiding light behind the European Wireless Testing is the so-called “RED” directive and the standard EN 301489-1. The primary difference between standard EMI tests and products with wireless is that the product must be tested to 6 GHz both in radiated emissions and immunity and be proven to work effectively in all other ranges. This is verified during testing by observing that correct information is shared between the product with the wireless design and a remote host such as a laptop which records when the packet is received and whether it is always correct. Usually, the 2.4-2.5 GHz band is used for most wireless applications and the modules used for wireless must receive previous approval with an extensive protocol. For that reason, it is highly recommended for manufacturers to seek out devices having been preapproved. The modules used in the US are not the same as those used in Europe due to varying frequency allocations.