It is the perfect solution for keeping the GC-01 Readers fully charged between data transfer downloads. The GC-03 can be placed in remote strategic locations for use while a guard is away from the main base. Keeping the rechargeable battery in the GC-01 Reader properly charged enables the GC-01 to perform a maximum of 8000 read events before it must be placed in the GC-02 Base for data download. The GC-03 does not require a PC connection. The included AC/DC wall adapter power supply enables the GC-03 to be placed anywhere it is needed.