At the closing meeting of the 2015 ITU World Radiocommunication Conference (WRC-15) on 27 November 2015, amongst the Final Acts signed into the International Radio Regulations was one approving "A Worldwide Frequency Allocation of 5351.5–5366.5 kHz to the Amateur Service on a secondary basis". The ITU's enhanced band allocation limits most amateurs to 15 watts effective isotropic radiated power (EIRP), with some countries allowed up to 25 W EIRP. The ITU allocation came into effect January 1, 2017, after which each country's national administration must formally revise their rules to permit amateur operation.