 
 <prompt> Wetin be di specification wey dey cover external power supplies? Given di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: For June 2009, many of di world biggest mobile phone manufacturers sign EC-sponsored Memorandum of Understanding (MoU), wey agree say make most data-enabled mobile phones wey dem dey sell for European Union compatible with common External Power Supply (EPS). Di EU common EPS specification (EN 62684:2010) dey refer to USB Battery Charging standard and e dey similar to GSMA/OMTP and Chinese charging solutions. For January 2011, International Electrotechnical Commission (IEC) release dia own version of di (EU) common EPS standard as IEC 62684:2011. 