Features: 1. Stable performance, small size, and high cost-effectiveness, it can meet customers' various needs. 2. Integrated USB to serial port chip, you can directly connect to the computer for debugging. 3. The SIM800C runs on GSM/GPRS 850/900/1800/1900MHz and supports worldwide use. 4. It can transmit voice, short message, and data information with low power consumption and can be applied to various design requirements of many small products. 5. Achievable SMS sending and receiving function, providing management software, convenient for sending and receiving SMS. 6. Supports phone function, one instruction can dial ATD10086. 7. Supports GPRS data transmission, suitable for small amounts of data transmission for industrial purposes, such as wireless meter reading, weather monitoring, etc. 8. Compatible with Bluetooth data transmission, compatible with Bluetooth standard IEEE802.15, working in the 2.4GHz frequency band, can be used for file transfer and data transmission with other Bluetooth-compatible devices. 9. Supports TTS voice synthesis, send text to the device during a call, the device converts the text to voice and outputs it to the mobile phone. Specification: Condition: Brand New Product Code: LC-GSM-SIM800C Working Voltage: DC5V Operating Temperature Range: -20-85 Operating Humidity Range: 0%-95%RH Size: Approx. 27 x 50.7 mm / 1.1 x 2.0 in Antenna Size: Approx. 50 x 17 x 11 mm / 2 x 0.7 x 0.4 in Package List: 1 x USB to GSM Module 1 x Antenna