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 functions 3. 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 cap 5. Two LED indicators on board for easy viewing of module operation status. 6. Onboard slot, supporting 1.8V and 3V SIM cards 7. 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: 11.14 Release 99 color: blue Material: PCB+Metal Specifications: /GPRS/audio parameters: Frequency band: : 850/900/1800/1900 MHz, supports automatic search of four frequency bands, and meets the phase 2/2+standard Transmission power: 4 (2W @ 900MHz), 1 (1W @ 1800MHz) GPRS connection characteristics: GPRS multi slot 12/10 (default), GPRS multi slot 1~12 (configurable) GPRS data characteristics: /downlink transmission rate: 85.6kbps Support packet control channel (PBCCH) Coding : -1, -2, -3, -4 Supporting PAP protocol (password authentication protocol) for connection Support unstructured supplementary data service (USSD) Short Message (SMS): Support types: MT, MO, CB, , PDU SMS storage device: Audio characteristics: Speech codec mode: Half Rate, Full Rate Enhanced Full Rate,Adaptive Muti Rate Support cancellation function Support noise suppression function Power supply voltage: 5V level: 5V/3.3V (3.3V by default) Operating temperature: - 40~85 C Storage temperature: - 45~90 C Product size: 30.2 x 65mm Package Contents: 1 x R800C /GPRS HAT 1 x antenna 1 x RPi copper package Only the above package content, other 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.