The present invention provides isolated -Glucuronidase having activity at acidic pH and nucleic acids encoding the same. Each conductive contact includes a first contacting finger and a second contacting finger extending substantially along a mating direction and toward each other and respectively exposed in corresponding receiving passage of the insulative housing for electrically engaging with the same contact of a complementary connector. The control unit also generates a packet signal for use in control and packet signals for use in inquiry. The power save command includes a start time and a predetermined time period, both which are stored in ESL registers.