1、The locking of the fixed module is added to facilitate the installation and improve the reliability and stability of the module. 2、For PCB, which has 4 screw holes added so that the adapter card can be used inside the industrial control chassis. 3、Increase the distance between the SIM card holder and the rear panel components, so that the user can disassemble the SIM card more conveniently. 4、Add USB 4-wire input hole plate to solder the USB cable directly. 5、Fine workmanship ensures good performance. This product is suitable for 3G modules of many brands, such as for Huawei, ZTE, Longshang, Fangge, Meige, Domain, Mobile, AIRCARD, OPTION, SAMSUNG, Huayu, Datang and other brand 3G cards. It is used for brushing, debugging, testing and unlocking of the Internet and 3G modules through the USB port. It can also be tested by USB for the USB bus (USB bus) and Mini PCI-E interface card (USB bus). Features: 1. The locking of the fixed module is added to facilitate the installation and improve the reliability and stability of the module. 2. For PCB, which has 4 screw holes added so that the adapter card can be used inside the industrial control chassis. 3. Increase the distance between the SIM card holder and the rear panel components, so that the user can disassemble the SIM card more conveniently. 4. Add USB 4-wire input hole plate to solder the USB cable directly. 5. Fine workmanship ensures good performance. Specification: Material: ABS Color: shown as picture Size: about 4*3*1cm/ 1.57* 1.18* 0.39inch Package List: 1 * Converter Card 1 * Screwdriver 1 * Screw Package