ITEM NAME:SIM800C GSM GPRS Module 51 Single Chip Microcomputer STM32 TTS DTMF G800C YVT.Model SIM800C GSM GPRS module. Size: GSM GPRS module 4cm 3.7cm 0.5cm,51 MCU 3cm 1cm 0.5cm. Features: GSM GPRS mode. Product list :1pcs GPRS module 51 MCU. Type: power module. We want to make sure you are happy with our item.