GSM GPRS Module SIM800C USB Wireless Communication Modem with Bluetooth Phone Voice SMS Data Transmission Item Type: GSM GPRS Module Material: PCB Functions: Telephone voice, SMS sending and receiving, Bluetooth transmission, etc. Network Frequency: GSM GPRS 850, 900, 1800, 1900MHz SIM Card Type: MicroSIM(not included) Product Features: 1. Onboard SIM800C GSM GPRS module 2. On board CH340T USB to serial chip, easy driver installation, high compatibility 3. The module is powered on automatically and connected to the network. No button is required to control the startup 4. Support SMS sending and receiving 5. Support GPRS data transmission under 2G network, can be applied to mobile meter reading and other occasion 6. Support Bluetooth data transmission, IEEE802.15 Bluetooth standard, 2.4GHz working band 7. Support adaptive baud rate 8. With the work indicator red LED, no network, no SIM card or SIM card inserted in the reverse LED blink at a quick interval of 1 second, normal access to the network once every 3 seconds