Onboard voltage translator, operating voltage can be configured to 3.3V or 5V via jumper. Baudrate: 300bps ~ 4Mbps (default: 115200bps). Autobauding baudrate: 9600bps ~ 115200bps. Control via AT commands (3GPP TS 27.007, 27.005, and V.25TER command set). Supports SIM application toolkit: SAT Class 3, GSM 11.14 Release 99, USAT. Comes with development resources and manual (examples for Raspberry Pi/Jetson Nano/Arduino/STM32).