SainSmart Small GSM GPRS SIM900 for Arduino UNO， Mega<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Can work with Arduino Uno; Only work for 2G network</li><li>SainSmart is well known and provides high quality electronics product</li><li>Embedded TCP/UDP stack - allows you to upload data to a web server</li><li>Quad-Band 850/900/1800/1900 MHz - would work on GSM networks in all countries across the world</li><li>Short Message Service - so that you can send small amounts of data over the network (ASCII or raw hexadecimal)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/517DbMGK%2B9L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51CL16%2BtfPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51FeACcE-bL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51sh%2B6YFqqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51mWTHJzkKL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51HF49w%2B-wL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51WsZAcjbnL.jpg" noproxy>