Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson Nanos; 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;Baudrate auto detection (1200bps ~115200bps) Onboard voltage level translator, 3.3V by default, switch to 5V via jumper;2x LEDs for indicating the module working status;SIM card slot for 1.8V/3V SIM card Control via AT commands (3GPP TS 27.007, 27.005, and SIMCOM enhanced AT Commands);Supports SIM application toolkit: GSM 11.14 Release 99 Comes with development resources and manual (examples for Raspberry Pi/Jetson Nano/Arduino/STM32),wiki link: www.waveshare.com/wiki/SIM800C_GSM/GPRS_HAT