Features: Brand new and high quality This product is expansion board that supports 4G/3G/2G communication and GNSS positioning functions, which is universal, LTE cat-4 (up to 150Mbps) and low power consumption. Easily realize the functions of 4G high-speed Internet access, wireless communication, remote video monitoring, making phone calls, texting, global positioning and so on. Based on the design of GPIO 40PIN, it is convenient to plug directly support dial-up Internet access, telephone, email, UDP, DTMF, HTTP, FTP and other functions. On-board USB interfaces can be used to test AT instructions, obtain positioning information and other control interfaces such as UART, which is convenient to access main control boards. On-board 3.5mm interfaces, with earphone and microphone function, can be used for two-way call, and on-board 2 LED indicators, which is convenient for viewing the running status of the module. Specifications: Material:Plastic Rate Ranges Supported: 300bps-4mbps (Default Is 115200bps) Support Automatic Rate Identification: 9600bps-115200bps Size:Approx.100x79mm/3.93x3.11inch Package Includes: 1 Set Expansion Board note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.