客户这里的EER是什么意思？ - 求解答

正在和一荷兰客户，谈的产品是移动电源和背夹电池类。客户邮件提到EER standards and rules，不理解这里的ERR指的是什么？ 是产品不良率吗？ 客户邮件： we need to make sure we handle in accorance with the EER standards and rules. I he had a lot of contact with professials around here, but the process is not going that easy as I hoped it would be. 知道货了解的前辈们，麻烦赐教。谢谢了！