Sell SIM card backup - SL-274

SIM card backup - SL-274
1. Back up and duplicate the directory materials in GSM or the CDMA cell-phone card;
2. Capacity 32KB, can store 4 cards' directory, total 1000 group telephone number;
3. Single unit, no need to be connecting with computer;
4. Share the backing up device materials with any cell-phone card ;
5. Even if power is exhausted, will not lose the materials.
6. Number display, can display the backup status;
7. Clock Function.