Description On board original SIM800C GSM GPRS module The on board CH340T USB serial port chip has simple driver installation and high compatibility Self resilient SIM card slot design can use mobile or Unicom 2G 3G 4G Micro Sim and Nano cards Module power on automatic boot up connection network do not need keys to control the boot up eliminating the trouble of boot up process Support SMS sending and receiving provide management software Provide references to PC source code c vb supporting information and instructions for use It supports GPRS data transmission in 2G network and can be used in mobile meter reading and other occasions Support bluetooth data transmission IEEE802 15 bluetooth standard 2 4 GHz working frequency band Support adaptive baud rate With working indicator no network no SIM card or SIM card insertion reverse time LED lamp flickers at one second interval normal access to the network three seconds a flash Dimension 27 x 50 7 mmManual http myosuploads3 banggood com products 20190328 20190328044341USBtoGSMmodule pdfSchematic http myosuploads3 banggood com products 20190328 20190328044347SIM800CV3Schematic pdf Package included 3 x LC GSM SIM800C 2 USB to GSM Serial Port GPRS SIM800C Module