Universal Mono Pre-Amplifier Kit - K1803 by Velleman. Intermediate level soldering kit<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Power supply: 10-30V DC / 10mA (not incl.) </span></li><li><span class="a-list-item"> Adjustable output level: max. 40dB. Max. input signal: 40mV </span></li><li><span class="a-list-item"> Frequency range: 20Hz to 20kHz ± 3dB </span></li><li><span class="a-list-item"> PCB dimensions: 1.2 x 1.7" </span></li><li><span class="a-list-item"> Electronic kit. Soldering and assembly required. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51smmnuQLVL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51etB6PmHbL.jpg" noproxy>