Features:
HiFi tube amplifier, mellow and plump sound.
Eight 470UF capacitor filter, pure power supply system, no hum.
Boost AC 12V to 28V: prolong the tubes' life-span and improve S/N.
Comes with 3 tubes: 2 for normal working, 1 for standby.
With volume controller, 2 audio input and output interface.
With LEDs on the bottom of the tubes, send out soft orange light when it is working.
Great for smartphone, computer, CD, DVD, MP3, and other audio equipments.

Specifications:
Material: Acrylic and PVC
S/N: >=90dB
Sensitivity: <=230mV
Distortion: <=0.1%(1kHz)
Frequency range: 20Hz - 500Hz
Impedance: 47ohm
Power adaptor: US Input: 110V 60Hz
                         Output: 12V 3A
Plug adaptor: EU 125/250V 6A
Item size: Approx.11 * 8 * 4cm / 4.3 * 3.1 * 1.6in
Item weight: 145g / 5.1oz
Package size: 20 * 14 * 4cm / 7.9 * 5.5 * 1.6in
Package weight: 408g / 14.4oz

Package List:
1 * HiFi Amplifier
3 * Tube
1 * Power Adaptor(US)
1 * Plug Adaptor(EU)

Note:
The HiFi amplifier should be assembled by yourself.
I1716US-110