Seeed Studio GPRS Arduino Shield V2.1<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Compatible with standard Arduino and Arduino Mega</li><li>Quad band support: 850/900/1800/1900MHz</li><li>Supports TCP/UDP protocols</li><li>Full control via AT commands set: Standard - GSM 07.07 &amp; 07.05 and Enhanced - SIMCOM AT Commands</li><li>2-in-1 headset jack</li></ul></div><img src="http://ecx.images-amazon.com/images/I/414Ugzk9s6L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/513zXsyd3ZL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51is6SsQ6AL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41PST8k8RmL.jpg" noproxy>