• Support GPRS and wifi two main technology, seamless switch in these two.
  • Based on ESP8266 (or 8285) wifi IC.
  • Serial UART communication from MCU to A20, or camera data from A2; A20 data transmission via GPRS or wifi to user.
  • GPRS and Wifi can power alone, and work alone.
  • Support four working mode, GPRS mode, wifi mode, both mode, wifi control GPRS and camera mode. use esp8266/8285 secondary uart port, this need develop your own program.
  • Semi-hole technology, through the standard SMT equipment to achieve the rapid production module for customers with high reliability of the connection, especially for automation, large-scale, low-cost modern production methods.


  • Outdoor monitoring, agricultural monitoring, industrial monitoring, intelligent home appliances, driving test system, Fingerprint Face Camera Punching machine, video doorbell camera camera lights in many fields.
  • Can get pictures at the same time, through WiFi or GPRS seamless switch transmission, become the biggest bright spot of its application.


  • WiFi + GPRS Combo;
  • Size 22.80 × 19.80mm;
  • Operating temperature -30 ℃ to + 80 ℃;
  • Operating voltage 3.3V-4.2V;
  • Boot voltage> 3.4V;
  • Power supply: DC 5V 1A;
  • Support GSM / GPRS four frequency bands, including 850, 900, 1800, 1900MHz;
  • Support global GSM network;
  • Support serial port and network communication;
  • Support SMS messages;
  • Support camera, picture compression format: JPEG standard;
  • Image resolution: VGA (640 * 480), QBGA (320 * 40), QQBGA (160 * 120), can be set through the serial port instruction;
  • Support for transmission of pictures, the maximum speed of 16KB / S;
  • Support for external 300,000 pixel camera;
  • GPRS Class 10;
  • Sensitivity <-105;
  • Built-in ESP8285/8266 WiFi chip, support WiFi chip secondary development;
  • Support GPRS data services, the maximum data rate, download 85.6Kbps, upload 42.8Kbps;
  • Support for digital audio and analog audio, support HR, FR, EFR, AMR voice coding;
  • Support ROHS, FCC, CE, CTA certification;

Documentation see on this page.


Additional information

Weight 0.005 kg


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