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SIM900A V4.0 Kit Wireless Extension Module GSM GPRS Board with Antenna is based on SIM900A chip having onboard two set power of supply interface namely VCC5 5V power supply, VCC4 interface, 3.5–4.5V power supply, optional power on self-starting (default), and control start. The onboard SMA (default)..

WEMOS D1 Mini V4.0.0 TYPE-C USB WIFI Internet of Things Board Based ESP8266 4MB LOLIN 12C MicroPython Nodemcu Arduino CompatibleProduct Description:This module is a Mini development board based on ESP8266 WiFi, with built-in WiFi function and USB serial port function. It can be directly connected t..