It's a breakout board for W5100 embedded TCP/IP chip. Included on the board is an RJ-45 with X’FMR connector. It can be used as a component and little effort is required to interface to the W5100. This module is an ideal option for users who want a simple solution to adding TCP/IP capability to their project.
This GSM module is a breakout board and minimum system of SIM900 Quad-band GSM/GPRS module. It can communicate with controllers via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands). This module support software power on, reset, data transfer and audio.