specifications:<br />overall size: about 10.5x4.5x6cm<br />input: dc 12v-24v.<br />barrel inner diameter: 2.1cm/0.83&quot;<br />barrel inner length: 3.6cm/1.42&quot;<br />usb output voltage: dc 5v<br />usb output current: 2.1a/1a<br />compatible with: all