A toner supply device is equipped with a coupling that has a toner supply opening on the side wall, a partition wall provided in this coupling integrally with a specific space provided on the inner wall and a hole larger than a toner supply opening on the side wall. The system is an end-to-end solution having one or more location systems for outputting requested locations of hand sets or mobile stations based on, e. The current driven to the load can be obtained by measuring the mirror current with an amperemeter.