Features 1、GOOD COMPATIBILITY: Suitable for Raspberry Pi 4B 3B+ 3B 2B, for Zero, for Zero W, for Zero WH and other modules with USB interface. 2、MULTIPLE FUNCTION: The expansion board module supports SMS, MMS, mail, TCP, UDP, DTMF, HTTP, FTP, etc., with strong practicability. 3、WITH INTERFACES: Type‑C interface is used to test AT commands, obtain Internet data, etc., with Mini PCI‑E slot for LTE 4G 3G module via USB interface. 4、OTHER PARTS: Onboard voltage converter, with SIM card slot, support 1.8V 3V SIM card, LED indicator for easy monitoring of working status. 5、EASY TO INSTALL: Expansion board is equipped with cooling fan, data cable and screw fasteners for easy installation and testing. Specification Item Type: Expansion Board Module Material: PCBA Power Supply: 5V Applicable: For Raspberry Pi 4B 3B+ 3B 2B, for Zero, for Zero W, for Zero WH Compatible: For Quectel EC20, for HUAWEI ME909S-821, for LONGSUNG U9300C, for SIM7600E-H and any other Mini PCIe LTE 4G 3G modules. Colour: Black Package List 1 x Module 1 x Fan (Random Brand) 4 x Screws 2 x Nuts 1 x Data Cable