BlueFire PWM 30A Digital Solar Charge Controller Regulator 12V 24V with USB/DC Charger Port<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> High charging efficiency， tandem PWM charging way， longer battery life </span></li><li><span class="a-list-item"> Short circuit protection and Protect from the lighting strike. </span></li><li><span class="a-list-item"> Reserve discharging protection and Reserve-polarity protection. </span></li><li><span class="a-list-item"> Under-voltage protection. Overcharging protection. Over-load protection. </span></li><li><span class="a-list-item"> 12/24V self-adaptive， USB 5.0V mobile phone charging， and dual-way DC12/24V output. NOTE: If the battery is 12V， then the output is DC 12V. If the battery is 24V， then the output is DC24V. </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/411yfWB8foL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51ROTlEGviL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51OONMQCahL.jpg" noproxy>