DIY Portable HIFI Preamp Amp Headphone Amplifier 3.5mm 100 - 240V US Plug

Features:
High-quality headphone amplifier - Allows you to play your music louder with lower distortion.
High treble, transparent in the middle, mellow bass, presents excellent frequency separation performance ( Classical music, POP pop songs, instrumental music, etc.)
HIFI enthusiasts can DIY themselves.
Strong driving force, dynamic wide, and high-quality sound.
Optimized circuit design with extremely low noise floor.
External dedicated power supply.
Supports plug & play.

Specification:
Type: Headphone Amplifier
Plug type: US
Material: Aluminum Alloy
Signal to noise ratio: 100db
Resolution: < -100db
Frequency response range: 20Hz - 25KHz
Distortion: 0.003%
Input interface: 3.5mm
Power: 300mW
Weight: Approx. 593g / 20.9oz
Item size: Approx. 100 * 70 * 24mm / 3.9 * 2.8 * 0.02in
Package size: Approx. 20 * 11.2 * 14.4cm / 7.9 *  4.4 * 5.7in

Package list:
1 * Headphone Amplifier
1 * Power Adapter
1 * Power Charging Cable
1 * Electronic Tube
1 * Recording Cable

Note:
Please allow slight error due to manual measurement. Thanks for your kind understanding.