Built-in original SIM800C GSM/GPRS module; USB communication, no need to write code; Built-in USB to serial port CH340T chip, easy installation and high compatibility Support quad-band, 2G/3G/4G, 850/900/1800/1900MHz, universal use all over the world Support SMS messaging and provide management software Support data transmission GPRS over 2G network, which can be applied to mobile meter reading and other occasionsSupport Bluetooth data transmission, IEEE802.15 Bluetooth standard, 2.4GHz working frequency band and data rate baud rate adaptiveIt is a quad band GSM/GPRS module with stable performance, compact appearance and high cost, which can meet various needs of customers. Thanks to the USB to serial port chip, you can connect to the computer to debug directly. SIM800C works at GSM/GPRS 850/900/1800/1900MHz, usable worldwide. It can transmit voice, SMS and data information with low power consumption, and also can be applied to different design requirements of many compact products. Parameters: Working voltage: DC 5V Working temperature range: -20~85Working humidity range: 0%-95% RH Using steps: Connect 2.4GHz GSM antenna Insert SIM card Connect module to PC Install CH340 reader software Module begins to initialize and LED flashes once per second Package: 1 * module without wire SIM800C USB GSM GPRS Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some difference color, depending on the physical item received.