There is a way to detect the original: www.easymouse.tv A unique serial number on a hologram seal and the imprint. Without this information, the part is a fake and function of luck. Rather take a few extra EUR in hand and buy the original.
My back went to amazon, money back and buy stock. Thanks to Amazon and appeal to HM SAT Shop. Please do not sell this garbage even further, you'll get it back but to be defective ...
Thanks!