1, This product can back up and duplicate the directory materials in GSM or the CDMA cell-phone card fast ; 2, Back up capacity of device 8KB , can store 250 group telephone number originally; 3, This product is that a unit is operated, do not need connecting with computer and using ; 4, After materials back up, cell-phone for instance, is it neednt afraid and lose the directory materials either to lose; 5, When users need to use different cell-phone card because of different city or country, can share the backing up device materials to any cell-phone card ; 6, Even if the power is exhausted, will not lose the materials that have already store been in the spare device either. It is the fashion treasure for the mobilephone users and gift-presenting, with great features of Novelty design, small and exquisite, and fashion practical. Our company can print customers mark and design on the SIM Card Device or design packing as the requirements. It is the best choice for the company to do sale promotion, propagandize the companys new image, and achieve the publicity.