features: 1. Based on the design of for 40PIN GPIO interface, applicable to series motherboards and Nano. 2. Support SMS, telephone, GPRS, /IP, DTMF, HTTP, and other functions3. Lead out UART control interface, which can be used to access /STM32 and other main control boards. 4. On board level conversion circuit, which operates at 3.3V by default, can be set to 5V through jumper cap5. Two LED indicators on board for easy viewing of module operation status. 6. Onboard slot, supporting 1.8V and 3V SIM cards7. Support rate range: 2400bps~115200bps (115200bps by default)8. Support AT control (3GPP 27.007, 27.005 and SIMcom enhanced set) 9. Support for SIM application kit: GSM 11.14 Release 99color: blueMaterial: PCB+MetalSpecifications:GSM/GPRS/audio parameters:Frequency band: GSM: 850/900/1800/1900 MHz, supports automatic search of four frequency bands, and meets the GSM phase 2/2+standardTransmission power: Class 4 (2W @ 900MHz), Class 1 (1W @ 1800MHz)GPRS connection characteristics: GPRS multi slot class 12/10 (default), GPRS multi slot class 1~12 (configurable)GPRS data characteristics:/downlink transmission rate: 85.6kbpsSupport packet broadcast control channel (PBCCH)Coding : -1, -2, -3, -4Supporting PAP protocol (password authentication protocol) for connectionSupport unstructured supplementary data service (USSD)Short Message (SMS):Support types: MT, MO, CB, , PDUSMS storage device: Audio characteristics:Speech codec mode: Half Rate, Full RateEnhanced Full Rate,Adaptive Muti RateSupport cancellation functionSupport noise suppression functionPower supply voltage: 5V level: 5V/3.3V (3.3V by default)Operating temperature: - 40~85 CStorage temperature: - 45~90 CProduct size: 30.2 x 65mmPackage Contents:1 x R800C GSM/GPRS HAT1 x GSM antenna1 x RPi copper pole packageOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.