RioRand® NE555 Pulse Generator Adjustable Frequency Module 5-12V DC<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Powered by RioRand Advanced Technology</li><li>onboard chip NE555</li><li>single output， the output duty cycle square wave is about fifty percent</li><li>. onboard adjustable resistance， resistance to adjust the output frequency can be controlled， Onboard power indicator</li><li>working voltage: 5 ~ 12V DC ; board size: 29 (mm) x12 (mm)</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51b7A90roBL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51%2BVvAektqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51-MSwxIuLL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51-ii%2BCg1hL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51pSYW9LeQL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51VcU8fptjL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41rYvXfHQpL.jpg" noproxy>