?<strong>Features:</strong><br>HiFi headphone amplifier£¬ great for high-impedance phones to have a mellow and plump sound.<br>Dual ways input: 3.5mm &amp; RCA (L &amp; R) interfaces.<br>Use the "Select" to choose the input way. (Eg: When you choose "3.5mm" audio in£¬ don't have to pull out the "RCA" line.)<br>High precision power divider circuit can guarantee the stability of the circuit.<br>6.35mm headphone output interface and a adapter (6.35mm to 3.5mm) for almost all of the headphone.<br>High-quality aluminum alloy case£¬ exquisite and durable.<br><br><strong>Specifications:</strong><br>Material: Aluminum alloy<br>S/N: &gt;=105dB<br>Distortion: &lt;=0.003%<br>Frequency range: 20Hz - 30kHz<br>Powered by: DC 24V<br>Power adapter: US Input: 100-240V 50/60Hz 0.3A<br>??????????????? ? ? ? ? ? ? Output: 24V 0.5A<br>Item size: Approx.13 * 7 * 3cm / 5.1 * 2.8 * 1.2in<br>Item weight: 208g / 7.4oz<br>Package size: 22 * 16.5 * 6cm / 8.7 * 6.5 * 2.4in<br>Package weight: 444g / 15.7oz<br><br><strong>Package List:</strong><br>1 * Headphone amplifier<br>1 * Adapter (6.35mm to 3.5mm)<br>1 * Power adapter(US)<div><span style="color: #666666; font-family: Verdana£¬ Arial£¬ Tahoma; line-height: 20px;">?</span></div>