Note:1. This product requires a card to be used, and the delivery does not include the card.2. Once the product is unplugged and then plugged into the same USB port, you need to re-click the installed software to enter the connection before it can be used. If you plug in a different USB port of the same computer, the computer will automatically re-download the driver and software installation, and the customer needs to enter the software to connect.For The Connection Can Not Be Summary Of The Problem :A, Sim card frequency band and the machine band does not match, need the customer to sim card and machine matching band can be used (for example, the customer's sim card is B2, B4, B7, B20) but the machine is (B1/B3), this time no matching band can not be usedB, the machine band and sim card band match, but still can not connect, this time let the customer connect to the computer, will automatically install the software, open the software to check the APN of the machine, and call the operator to ask the APN of the detailed data. If it doesn't match, change it in the software and you'll basically be able to connectSpecification:Product size: The SIM card is a standard card size of 25mm x 15mm.Working frequency band: LTE-FDD: B1/B3Wireless standard: IEEE 802.11bFirewall function: Support firewallSafety standard: icSystem: FDD-LTEChip: Qualcomm 9200Network type: FDD-LTE, WCDMA/DC-HSPA+External interface: USB 2.1, standard 6-pin SIM card interface, memory card port (excluding SIM card and memory card)Frequency range: FDD: B1/B3WCDMA: 2100MHzRate: UL50M/DL150MbpsSupport OS: 32/64 bit: For Win 2000/2003/XP/Vista/7/10, for OS 10.4 or higher, for Linuxsecurity mode: Open, WPA-PSK, WPA2-PSKPackage list:1 * 4G Router1 * English Manual 11