Raspberry Pi connectivity, compatible with Raspberry Pi 2B/3B/3B+/Zero/Zero W
Supports SMS, GPRS, DTMF, HTTP, FTP, MMS, email, etc.
Bluetooth 3.0, supports data transferring through Bluetooth
UART interface, for connecting host control boards like Arduino/STM32
Onboard voltage level translator, 3.3V by default, switch to 5V via jumper