Feature: 1. COMPATIBILITY: The expansion board is designed based on the for RasPi for 40PIN GPIO interface, which can be applied to for RasPi series motherboards, etc. to achieve seamless integration between multiple platforms. 2. MULTI PROTOCOL SUPPORT: Support for LWM2M, COAP, MQTT, TCP, UDP, HTTP, HTTPS and other protocols communication, expanding the scope of application to adapt to a variety of different development needs. 3. FLEXIBLE CONTROL: The module leads to the UART control interface, and can also be intervened for STM32 and other main control boards, to achieve diversified function development. 4. CONVENIENT DEBUGGING: The onboard USB interface is convenient for power supply or software debugging, and the onboard 2 LEDs can be used to check the module's operate status at any time, which can help you easily carry out project development. 5. ACCURATE CONTROL: Support serial port baud rate range from 300bps to 921600bps, while the default is 115200bps. Meanwhile, it supports AT command control, which makes the device operate more accurate and convenient. Specification: Item Type: Expansion Board Material: PCB Weight: Approx. 61g / 2.2oz Network Band: B1 B3 B5 B8 SIM Card Slot Type: Standard SIM Card (Excluded) Supply Voltage: 5V Logic Level: 5V 3.3V (Default 3.3V) Functions: 1. Based On For RasPi 40PIN GPIO Interface Design, Suitable For RasPi Series Motherboards 2. Support For LWM2M, COAP, MQTT, TCP, UDP, HTTP, HTTPS And Other Protocols. 3. Onboard USB Interface, Can Be Used For Power Supply Or Software Debugging 4. UART Control Interface, Can Be Used To Intervene In STM32 And Other Main Control Boards. 5. 2 Onboard LED Indicators, Easy To Check The Module's Operate Status 6. Support Serial Baud Rate Range: 300bps-921600bps (Default 115200bps) 7. Support AT Command Control (V.25TER, 3GPP TS 27.007 And AT Command Set). Package List: 1 x Expansion Board1 x Antenna1 x Data Cable1 x Instruction Manual5 x Screw3 x Nut