Function Characteristic: 1. To back up and restore your phone book data in cell-phone cards, avoid data loss from losing or damaging a cellular phone; 2. Support SIM card standard of GSM11.11, GSM11.12, GSM03.08, GSM03.40, CDMA3GPP2C.S0023-1 and ISO7816-1/2/3, can be used all over the world; 3. Capacity 32KB, can store 1000 group telephone numbers; 4. Single unit, no PC or PDA required; 5. Support data exchange among different sim cards; 6. Even if the power consumption is used up, the data will be kept well in the memory. 7. Number display, can describe the backup status; 8. Clock function. 9. Colors optional: RED, BLUE, YELLOW, BLACK, GREEN.