Features: 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) Supports SIM card standard of GSM11.11, GSM11.12, GSM03.08, GSM13.40, CDMA3GPP2C.S0023-1 and ISO7816-1/2/3 3) Capacity 8KB, can store 250 groups telephone number 4) Single unit, no PC or PDA required 5) Supports data exchange among different SIM cards 6) Even if power consumption is used up, the data will be kept well in the memory Packing: Blister packing