Fast shipping + free tracking number, High Speed Sim Card Reader / Writer / Copy / Cloner / Backup GSM / CDMA Blue Backup your sim card Allows you to copy different number to one sim card, including phone book, SMS, ring tones, photos, etc Software install will allow you to manage the sim card copying process An extra menu will appear on your phone and you can switch to the different moblie numbers Interface: USB . Read directly: Sim Card . Card Slots: Single Dimensions: 5.7 x 2.3 x 1.2cm/ 2.24" x 0.91" x 0.47" (L x W x H) . Weight: 0.63oz / 18g