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SIM800A GSM GPRS Module is an upgraded version of SIM900A
Standard Φ3
Output Pin Pull-up Current 4mA
20A @125V AC Switching Mode ON-ON Structure DPDT Type Locking Material Plastic and Metal Dimension(LxWxH) 31x25
Factory-trimmed for accuracy
ESP8266 ESP-01 WIFI Transceiver Wireless Module 5Dbi Flat Antenna SIM800A GSM GPRS Module isThe ESP 01 ESP8266 Serial WIFI Wireless Transceiver Module is a self contained SOC with an integrated TCP IP protocol stack that can give any microcontroller access to your WiFi network. The ESP8266 is capable of either hosting an Applications or offloading all Wi Fi networking functions from another Applications processor. Each ESP8266 module comes pre programmed with an AT command set firmware, meaning, you can simply hook this up to your Arduino
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