Features: 1.For Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+ 2.Support TCP, UDP, PPP, HTTP, FTP, MQTT, SMS, email and other functions 3.Support GNSS positioning (GPS, GLONASS and Beidou) 4.Onboard USB interface, can be used to test AT commands, obtain GPS positioning information, etc. 5.Pull out the UART control pin to access the main control board such as for STM32 specification:This is a extension board for Raspberry pie with NB-IoT (narrowband Internet of Things), eMTC (Enhanced Machine Class Communication), EDGE (Enhanced Data Rate GSM Evolution), GPRS (General Packet Radio Service) and GNSS (Global Navigation Satellite System) functions. Both NB-IoT and eMTC are emerging IoT communication technologies based on LTE (4G) evolution. They have the advantages of low power consumption, low cost, wide coverage, etc., and are very suitable for applications such as smart meters, remote control, asset tracking, remote monitoring, Internet of Things applications such as telemedicine, mobile POS terminals and shared bicycles. GSM/GPRS and EDGE are traditional 2G and 2.5G communication technologies that support the use of mobile phone cards for texting and wireless communication applications. Whether you want to try new technologies, make evaluations, or want to support multiple ways of communication and positioning, this product is a good choice. 1. For Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+ 2. Support TCP, UDP, PPP, HTTP, FTP, MQTT, SMS, email and other functions 3. Support GNSS positioning (GPS, GLONASS and Beidou) 4. Onboard USB interface, can be used to test AT commands, obtain GPS positioning information, etc. 5. Pull out the UART control pin to access the main control board such as for STM32 6. Onboard level shifting circuit, the default is 3.3V operation, can be set to 5V through 0 ohm resistor 7. Onboard SIM card slot, support for ordinary SIM card and NB-IoT dedicated card 8. Onboard 2 LED indicators for easy viewing of module operation status 9. Support serial port baud rate (300bps ~ 3686400bps) 10. Support AT command control (3GPP TS 27.007, 27.005 and SIMCOM enhanced AT command set) 11. Support SIM Application Toolkit (SAT Class 3, GSM 11.14 Release 98, USAT) Communications Parameters: NB-IoT eMTC EDGE GSM/GPRS Support Band FDD-LTE B1/B3/B5/B8 GPRS EDGE 900/1800 MHz GE Communication Cystem 4G 2.5G 2G Transmission Power Class 3 (0.5w LTE) Class E2 (0.5WEGSM900) Class E1 (0.4WDCS1800) Class 4 (2WGSM900) Class 1 (1WDCS1800) Transmission Rate Uplink 66kbps Downstream 34kbps Uplink 375kbps Downstream 300kbps Uplink 236.8kbps Downstream 236.8kbps Uplink 85.6kbps Downward 85.6kbps Support SIM Card NB special card SIM Card Applicable Area Asia Asia Most Countries and Regions GNSS Parameter: Receive: 16 channels C/A Code Sensitivity: Tracking :-162 dBm (GPS) / -157 dBm (GLONASS) / TBD (Beidou) Cold start :-148 dBm First positioning time: cold start: