Description: Brand new and high quality Features: USB to GSM is a quad-band GSM/GPRS module with stable performance, compact appearance and high cost-effectiveness, which can meet the different needs of customers. Integrated USB to serial port chip, can be debugged directly by connecting to the computer. SIM800C works on GSM/GPRS 850/900/1800/1900MHz, which can be used globally and can realize transmission of voice, SMS information and data information with low power consumption. Designed for a variety of compact products. Built-in original SIM800C GSM/GPRS module. Built-in CH340T USB to serial port chip, easy to install and high compatibility. Self-elastic SIM card slot for mobile or Unicom 2G/3G/4GMicro SIM and for Nano card. The module is automatically turned on to connect to the network, you do not need to press the button to control the startup, which eliminates the cumbersome startup process. Support for SMS messaging, provide management software. Provide reference to host computer source code (c#, vb) supporting materials and user manual. Support for GPRS data transmission under 2G network, can be applied in occasions such as mobile meter reading. Support for Bluetooth-compatible data transmission, IEEE802.15 Bluetooth-compatible standard, 2.4 GHz working frequency band. Support for adaptive bit rate. With the working indicator, there is no network, no SIM card or SIM card is inserted, the ED light flashes quickly with 1 second interval, and the normal access network flashes once every 3 seconds. Specifications: Item Type: USB to GSM Module Material: PCB board Size: 80x30mm/3.14x1.18in Color: Blue+Black Quantity: 1 Pc Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x USB to GSM Module 1 x Antenna