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On-board LM386 Chip
SIM800L-ESP800L GSM / GPRS module supports quad-band GSM/GPRS network including SIM800L GPRS and SMS message data
Onboard high-quality MCU and ESP8266 WIFI module
working environment
74266 (QUADRUPLE 2-INPUT EXCLUSIVE-NOR ) 297 On-board LM386 ChipIntroduction : 74HC266 Quad 2 Input Exclusive NOR Gate with Open Collector Outputs, 14 Pin DIP. Features : Logic Type : XNOR (Exclusive NOR) Number of Circuits : 4 Number of Inputs : 2 Features : Open Drain Voltage Supply : 2V ~ 6V Current Quiescent (Max) : 2 A Current Output High, Low : , 5. 2mA Logic Level Low : 0. 5V ~ 1. 8V Logic Level High: 1. 5V ~ 4. 2V Operating Temperature : 40C ~ 85C