Features At A Glance The SIM800C GSM/GPRS HAT is a handy, low power Raspberry Pi HAT which features multi communication functionalities: GSM, GPRS, and Bluetooth, with up to 85.6kbps GPRS data rate. It allows your Pi to easily send messages, connect to wireless Internet, transfer data via Bluetooth, and so on. Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson NanoSupports SMS, GPRS, DTMF, HTTP, FTP, MMS, email, etc.Bluetooth 3.0, supports data transferring through BluetoothUART interface, for connecting host control boards like Arduino/STM32Onboard voltage level translator, 3.3V by default, switch to 5V via jumper2x LEDs for indicating the module operating statusSIM card slot for 1.8V/3V SIM cardAutobauding baudrate: 1200bps ~115200bpsControl via AT commands (3GPP TS 27.007, 27.005, and SIMCOM enhanced AT Commands)Supports SIM application toolkit: GSM 11.14 Release 99Comes with development resources and manual (examples for Raspberry Pi/Jetson Nano/Arduino/STM32) WIKI: waveshare.com/wiki/SIM800C_GSM/GPRS_HAT?amazon