An electrical connector includes an insulating housing having a head section and a pair of guiding arms extending rearwardly from opposite ends of the head section, a number of signal and power contacts retained in the head section and a conductive shield enclosing the housing. With the arrangement, it is possible to cause a signal of a small amplitude to be level-shifted and latched at low power consumption. This method is further implemented in a bit receiver with a two-stage pipeline architecture to achieve the object of increasing data transmission bandwidth and efficiency. The lighting system may further have a cushioned layer coupled to the light modules.