Geekworm Raspberry Pi 3 Model B/2B Sim800 GSM/GPRS/SMS Board Quad-band Add-on Expansion Board for Raspberry Pi

[Overview]
This is a SIM800 GSM/GPRS add-on V2.0 board for Raspberry Pi 3 Model B/2B

[Features]
850/ 900/ 1800/ 1900 MHz
Class 12 GPRS multislot
3.3V DC operation level digital
9600(default) baud rate
-40 to +85 operation temperature
Stackable
UART interface

[WIKI]
http://www.raspberrypiwiki.com/index.php/Raspberry_pi_Sim800_Expansion_Board

[Indicators]
PWR (Power): When there is normal supply to the board, the indicator keeps on.
8STATUS (SIM800 status): When SIM800 works normally, the indicator keeps on.
NET (SIM800 network status): used to indicate network status, the working status of the indicator is as below:

Status SIM800 behavior
OFF SIM800 does not work
64ms on/800ms off SIM800 does not find network
64ms on/3000ms off SIM800 registers the network
64ms on/300ms off GPRS communicates

[Shipping List]
1 x External antenna
1 x Sim800 Expansion Board