Feature(may vary by option.)

●Pretty Sounds: Independent op amp and power supply will reduce interaction as well as improving noise ratio and sound quality.
●Wide Matching: Comes with 2 kinds of interfaces, 3.5mm and 2.5mm, the stereo amp is compatible with various balance and standard headphone.
●Smart Designs: The power supply, electronic tubes, and operational amplifiers are all independently symmetrical. Also, the dual op amp parallel output power is higher.
●Easy Carrying: Light in weight and compact in size, the vacuum tube headphone amplifier is very convenient to carry for outdoor use.
●Better Safety: Has built in battery circuit as well, when the battery is fully charged, it will automatically shut down and the charging indicator will turn green.

[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
Noise Ratio: 99dB
Recommended Load Impedance: 16-400Q

Package List:
1 x Headphone Amplifier
1 x Power 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 WIFI or 4G, 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.