Feature

●When using the headphone amplifier on your phone, if you hear some noise in your headphones, this could be the interference from the cell phone, such as WIFI or 4G . This is normal.To avoid this, keep your phone away from the headphone amplifier.
●The power supply, electronic tubes, and operational amplifiers are all independently symmetrical. Also, the dual op amp parallel output power is higher.
●The vacuum tube headphone amplifier is light in weight and small in size, allowing you to have a tube amplifier that you can hold in one hand, which is very convenient for outdoor use and carrying.
●Has built in battery protection circuit as well, when the battery is fully charged, it will automatically shut down and the charging indicator will turn green.
●Battery: 1 x 1000mAh 12V lithium battery, shipped with built in battery.

[US Plug 100 u2011240V]

Description

Specification:
Item Type: Headphone Amplifier
Model: B4 X
Material: Aluminium Alloy
Input: 3.5mm Stereo Input
Output: 2.5mm balanced output through BAL interface, and 3.5mm standard stereo interface output.
Charging Voltage: 12.6V
Battery: 1 x 1000mAh 12V lithium battery, shipped with built in battery.
Charging Time: 2-2.5 hours full battery.
Working Time: 4-4.5 Hours
Output Power: 450mW
to Noise Ratio: 99dB
Recommended Load Impedance: 16-400Q

Package List:
1 x Headphone Amplifier
1 Adapter
1 x Audio Cable
2 x Band
1 x User Manual

Note:
When using the headphone amplifier on your phone, if you hear some noise in your headphones, this could be the interference from the cell phone, such as , that interferes with the tube and makes the noise. This is normal. Because all tubes have a microphone effect. To avoid this, keep your phone away from the headphone amplifier.