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 performance, which can meet the various needs of customers. Integrated USB to serial port chip, can be debugged directly by plugging in the computer. SIM800C works at GSM/GPRS 850/900/1800/1900MHz, which can be used globally and can realize the transmission of voice, SMS information and data information with low power consumption. Designed for a variety of compact products. Onboard original SIM800C GSM/GPRS module. Onboard CH340T USB to serial port chip, easy to install and high compatibility. Self-elastic SIM card slot design for mobile or Unicom 2G/3G/4GMicro SIM and for Nano cards. The module is powered on automatically to connect to the net-work, no need to press the button to control the boot, eliminating the troublesome boot process. Support SMS messaging, provide management software. Provide reference to the host computer source code (c#, vb) supporting materials and instructions for use. Support GPRS data transmission under 2G net-work, can be applied to occasions such as mobile meter reading. Support Bluetooth-compatible data transmission, IEEE802.15 Bluetooth-compatible standard, 2.4GHz working frequency band. Support adaptive baud rate. With the work indicator, no net-work, no SIM card or SIM card is inserted, the ED light flashes quickly in 1 second interval, and the normal access net-work 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