Response from LEGO SHOP
19 April 2010
Doreen, Power Functions Specialist, LEGO Customer ServicesThanks for getting in touch with us. We are very sorry to hear that you are unhappy with one of our products. Our extension cables 8871 and 8886 are meant to assist with the transition from our 9V system to the current Power Functions system, as well as to offer an option to extend your Power Functions system. Although one of the plugs is a 4-stud 9V plug, Power Functions elements can be stacked on top of it. Therefore, the 9V end does not inhibit use with Power Functions. Specifically, if you have a motor and a battery box, the motor wire can be attached on top of the 9V end of the extension wire, and then the Power Functions end can snap onto the battery box or receiver. Thank you very much for your feedback. I will make sure that it reaches our experts in Denmark. If you have further questions, please feel free to contact us directly through http://service.lego.com/en-US/Contactus/default.aspx .