SIM800C GSM GPRS Module STM32 Microcontroller 51 With Bluetooth High TTSFeatures:1. SIM800C module 4 frequency module 、 available worldwide2. This small size SIM800C can be easily embedded in your system3. Serial TTL serial level compatible with a variety4. The antenna comes with a high-performance springs5. The lithium battery-powered interface、 can be directly connected to 4V lithium battery6. mainstream flip MICRO SIM card holder7. reserved voice、 Mike Pin Interface8. Size: 24mm x 25mmPackage included:1 x SIM800C GSM GPRS Module STM32 Microcontroller 51