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1×4 Key Matrix Membrane Switch Keypad 128x64 Graphic LCD Yellow Backlight Universal Availability: Extensively documented with Universal Availability: Extensively documented with thousands of application notes Parameter Details Module Type SIM800 GSM GPRS Modem Frequency Bands 850 900 1800 1900 MHz Interface UART (TTL RS232) Antenna External SMA Connector Power Supply 5V DC (with onboard regulator) Current Draw 500mA peak 1x4 Key Matrix Membrane Switch Keypad Quality electronics from The Engineer Store
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